"Is that so?" Strawn growled. "I'm not telling the papers everything, and if they are satisfied to call these murders '_crimes pa.s.sionnels_,'

it's all right with me. But I'm not forgetting that Nita Selim banked ten thousand dollars cash after she got to Hamilton. My real theory now that Sprague has been killed is that Nita and Sprague had cooked up some sort of racket between them, and that when Nita got the chance to come to Hamilton with Mrs. Dunlap, she jumped at it, and she and Sprague sprung their racket, whatever it was, either just before or just after Nita left New York. Probably it was Nita's tip-off and Sprague did the actual dirty work himself, which explains that telegram that Nita sent him April 24, just three days after she got to Hamilton. Let's see again just what it says," and Strawn reached for a copy of the night letter which Dundee himself had unearthed the day before. "See: '_Everything Jake so far, but would feel safer you here_--'"

"Yes, I remember the wording quite well," Dundee interrupted. "But you did not take it so seriously when I showed it to you yesterday. If you had--"

"All right! Rub it in!" Strawn snapped, flushing darkly. "If I had a.s.signed a man to 'tail' Sprague, as you suggested, he wouldn't have been murdered--"

"He probably would have been murdered just the same," Dundee comforted the older man, "but we might have been lucky enough to have had an eye-witness."

"Oh, you and your theory!" Strawn growled. "But let me go on.... Nita meant she would feel safer about Sprague if he was here in Hamilton, too. But the guy they double-crossed in New York, or worked the badger game on, or something like that, got on their trail. But it took him weeks to do it, and Sprague followed Nita's advice. He got here on Sunday April 27, and on Monday the 28th Nita banked the first $5,000!

Don't you see it, boy? Sprague brought with him the dough they'd got for their stunt, and thought it was safer for Nita to bank it in her name, since it wasn't the name she was known by in New York anyway. We've checked up on Sprague pretty thoroughly. He didn't have a bank book, either on his body or in his room, and every bank in town denies he had an account with them."

"If that theory is correct, it makes Nita Selim a pretty low character,"

Dundee mused aloud. "Not only did she kick him out as a lover, but she double-crossed him as her partner in crime, by willing the whole wad to Lydia Carr. Sprague must have received quite a shock when he heard Nita's will read at the inquest."

"Yeah," Strawn agreed. "It looks like Mrs. Dunlap picked a sweet specimen to make a friend out of.... Well, that's my theory, and I think it explains everything. Their victim in New York simply hired a gunman, or come down here himself, when he got on their tracks. Of course it was a good stunt to make it look like a local crime--figured he'd fool _me_ just as he fooled _you_! So the murderer simply trailed Nita around, and saw that whole bunch of society people shooting at a target at Judge Marshall's place, with a gun equipped with a Maxim silencer. Too good an opportunity to be missed, so he bides his chance to swipe the gun and silencer. To make sure it will look like a local crime, he pops off Nita when that same bunch is at her house, but it takes a few days longer before he has the same opportunity to get Sprague. But it come last night and he grabbed it."

"A very plausible theory, and one which, in general, the whole city of Hamilton has been familiar with since the night Nita was murdered,"

Dundee remarked significantly.

"What do you mean?" Strawn demanded. "It's waterproof, ain't it? Doc Price says the bullet--and a .32 caliber one at that--entered Sprague's body just below the breastbone and traveled an upward course till it struck the extreme right side of the heart. The bullet entered exactly where it would have to, if the murderer was crouching under that window while Sprague was raising the screen. And we have Carraway's report that it was Sprague's fingerprints on those nickleplated things you have to press together to make the screen roll up or down. Furthermore, I haven't a doubt in the world that the ballistics expert in Chicago will report that the bullet was fired from the same gun that killed Nita Selim."

"Neither have I," Dundee agreed. "But what I meant was that you had obligingly furnished the murderer who fits _my_ theory with a theory he--or she--would not have upset for the world!... Listen!" and he bent forward very earnestly: "I'm willing to grant that Sprague was shot from the outside, through the window, when Sprague raised the screen. But there our theories part company. I believe that the murderer was a guest in the Selim home last night, that he or she had made an appointment to meet Sprague there, on the promise of paying the hush money he had demanded, in spite of my warning to him not to carry on with the blackmail scheme. Naturally he or she--and I'll say 'he' from now on, for the sake of convenience--had no intention of being seen entering that room. The bridge game was suggested by Judge Marshall at noon.

There was plenty of time for the rendezvous to be made with Sprague. As I see it, the murderer told Sprague to excuse himself from the game when he became dummy, and to go to the trophy room and wait there until the murderer had a chance to slip away and appear beneath the window.

Sprague had been promised that, when he raised the screen at a tap or a whispered request, a roll of bills would be handed to him, but--he received a bullet instead."

"And which one of your six suspects have you picked on?" Strawn asked sarcastically.

"That's just the trouble. There are still six," Dundee acknowledged with a wry grin. "After Sprague's disappearance, every one of the six was absent from the porch at one time or another.... No, by George! There are _seven_ suspects now! I was about to forget Peter Dunlap, who admits he was alone on a fishing trip when Nita was murdered and who left the porch last night to go to the library, as soon as Sprague arrived!... As for the movements of the original six after Sprague disappeared: Polly Beale took a walk about the grounds; Flora Miles went upstairs to hunt for Karen Marshall, and was gone more than ten minutes; Drake went to the dining room to get the refreshments, and no one can say exactly how long he was gone; Judge Marshall went up to get his wife, and had time to make a little trip on the side; Janet Raymond walked over from her home, and pa.s.sed that very window, arriving after Sprague had disappeared; and, finally, Clive Hammond arrived alone in his car, which he parked within a few feet of that window. This morning he gets married----"

"A telegram, sir!" interrupted a plainclothesman, who had entered without knocking.

Strawn s.n.a.t.c.hed at it, read it, then exulted: "Read this, boy! I guess _this_ settles the business!"

The telegram had been filed half an hour before and was from the city editor of _The New York Evening Press_:

"WORKING ON YOUR THEORY OF NEW YORK GUNMAN RESPONSIBLE MURDERS OF JUANITA LEIGH SELIM AND DEXTER SPRAGUE THIS PAPER HAS DISCOVERED THAT SELIM WOMAN WAS SEEN AT NIGHT CLUBS SEVERAL TIMES DURING JANUARY FEBRUARY WITH QUOTE SWALLOW TAIL SAMMY END QUOTE UNDERWORLD NAME FOR SAM SAVELLI STOP SAVELLI TAKEN FOR RIDE TUESDAY APRIL TWENTY SECOND TWO DAYS AFTER SELIM WOMAN LEFT NEW YORK STOP POLICE HERE WORKING ON THEORY SAVELLI SLAIN BY OWN GANG AFTER THEY WERE TIPPED OFF SAVELLI WAS DOUBLE CROSSING THEM STOP IN EXCHANGE FOR THIS TIP CAN YOU GIVE US ANY SUPPRESSED INFORMATION YOUR POSSESSION STOP SAVELLI HAD BROTHER WHO IS KNOWN TO US TO HAVE PROMISED REVENGE SWALLOW TAIL SAMMYS MURDER STOP BE A SPORT CAPTAIN."

"Well, that puts the lid on it, don't it?" Strawn crowed. "I'll send Sergeant Turner to New York on the five o'clock train.... Pretty decent of that city editor to wire me this tip, I'll say!"

"And are you going to reciprocate by wiring him about the $10,000 Nita banked here?" Dundee asked.

"Sure! Why not? There's no use that I can see to keep it back any longer, now that no one can have any excuse to think as you've been doing--that it was blackmail paid by a Hamiltonian."

"Then," Dundee began very slowly, "if you really think your case is solved, I'll make one suggestion: take charge of Lydia Carr and put her in a very safe place."

"Why?" Strawn looked puzzled.

"Because, when you publish the fact that Nita and Sprague got $10,000 for tipping off Savelli's gang that he was double-crossing them, and that Nita willed the money to Lydia, the avenger's next and last job would be to 'get' Lydia, since his natural conclusion would be that Lydia had been in on the scheme from the beginning," Dundee explained.

"G.o.d, boy! You're right!" Strawn exclaimed, and his heavy old face was very pale as he reached for the telephone, and called the number of the Miles residence. "I'm going to put it up to her that it will be best for her to be locked up as a material witness, for her own protection."

Five minutes later Strawn restored the receiver to the hook with a bang.

"Says she won't budge!" he explained unnecessarily. "Says she ain't afraid and the Miles kids need her.... Well, it's her own funeral! But I guess _you_ are convinced at last?"

Dundee slowly shook his head. "Almost--but not quite, chief!"

"Lord, but you're stubborn! Here's a water-tight case----"

"A very pretty and a very satisfactory case, but not exactly water-tight," Dundee interrupted. "There's just one little thing----"

"What do you mean?" Strawn demanded irritably.

"Have you forgotten the secret shelf behind the guest closet in the Selim house?" Dundee asked.

"I can afford to forget it, since it hasn't got a thing to do with the case!" Strawn retorted angrily. "There's not a sc.r.a.p of evidence----"

"Of course it does not fit into _your_ theory," Dundee agreed, "for 'Swallow-tail Sammy's' avenging brother could not have known of its existence, but there is one thing about that secret shelf and its pivot door which I don't believe you can afford to forget, Captain!"

"Yeah?" Strawn snarled.

"Yeah!... I refer, of course, to the complete absence of fingerprints on the door and on the shelf itself! Carraway didn't even find Nita Selim's fingerprints. Since Nita would have had no earthly reason for carefully wiping off her fingerprints after she removed the papers she burned on Friday night, it's a dead sure fact that someone else who had no legitimate business to do so, touched that pivoting panel and the shelf, and carefully removed all traces that he had done so!... And--" he continued grimly, "until I find out who that someone is, I, for one, won't consider the case solved!"

Fifteen minutes later Dundee was sitting at Penny Crain's desk in her office of the district attorney's suite, replacing the receiver upon the telephone hook, after having put in a call for Sanderson, who was still in Chicago, keeping vigil at the bedside of his dying mother.

"Did you find out anything new when you questioned the crowd this morning?" Penny asked. "Besides the fact that Polly and Clive got married this morning, I mean.... I wasn't surprised when I read about the wedding in the extra. It was exactly like Polly to make up her mind suddenly, after putting Clive off for a year----"

"So it was Polly who held back," Dundee said to himself. Aloud: "No, I didn't learn much new, Penny. You're a most excellent and accurate reporter.... But there were one or two things that came out. For instance, I got Drake to admit to me, in private, that Nita did give him an explanation as to where she got the $10,000."

"Yes?" Penny prompted eagerly.

"Drake says," Dundee answered dryly, "that Nita told him it was 'back alimony' which she had succeeded in collecting from her former husband.

Unfortunately, she did not say who or where the mysterious husband is."

"Pooh!" scoffed Penny. "Don't you see? She just said that to satisfy Johnny's curiosity. After all, it was the most plausible explanation of how a divorcee got hold of a lot of money."

"So plausible that Drake may have thought of it himself," Dundee reflected silently. Aloud, he continued his report to the girl who had been of so much help to him: "Among other minor things that came out this morning, and which the papers did not report, was the fact that Janet Raymond tried to commit suicide this morning by drinking shoe polish. Fortunately her father discovered what she had done almost as soon as she had swallowed the stuff, and made her take ipecac and then sent for the doctor."

"Oh, poor Janet!" Penny groaned. "She must have been terribly in love with Dexter Sprague, though what she saw in him----"

Dundee made no comment, but continued with his information: "Another minor development was that Tracey Miles admitted that he and Flora had quarreled over Sprague after all of you left, and that Flora took two sleeping tablets to make sure of a night's rest."

"She's been awfully unstrung ever since Nita's murder," Penny defended her friend. "She told us all Monday night at Peter's that the doctor had prescribed sleeping medicine.... Now, you look here, Bonnie Dundee!" she cried out sharply, answering an enigmatic smile on the detective's face, "if you think Flora Miles killed Nita Selim and Dexter Sprague, because she was in love with Dexter and learned he was Nita's lover from that silly note----"

"Whoa, Penny!" Dundee checked her. "I'm not linking exactly that. But I've just remembered something that had seemed of no importance to me before."

"And what's that, Mr. Smart Aleck?" Penny demanded furiously.

"Before I answer that question, will you let me do a little theorizing?"

Dundee suggested gently. "Let us suppose that Flora Miles was _not_ in love with Sprague, but that she was being blackmailed by Nita for some scandal Nita had heard gossiped about at the Forsyte School.... No, wait!... Let us suppose further that Nita recognized Flora's picture in the group Lois Dunlap showed her, as the portrait of the girl whose story she had heard; that she was able, somehow, to secure incriminating evidence of some sort--letters, let us say. Nita tells Sprague about it, and Sprague advises her to blackmail Flora, who, Lois has told Nita, is very rich. So Nita comes to Hamilton and bleeds Flora of $10,000. Not satisfied, Nita makes another demand, the money to be paid to her the day of the bridge luncheon----"