"I don't understand you," Graham said. "You're sure of your man but you keep no close watch on him. Do you know where he is now?"

"Haven't the slightest idea, Mr. Graham."

"What's to prevent his running away?"

"I'm offering him every opportunity. He wouldn't get far, and I've a feeling that if he confessed by running he'd break down and give up the whole thing. You've no idea how it frets me, Mr. Graham. I've got my man practically in the chair, but from a professional point of view it isn't a pretty piece of work until I find out how he got in and out of that room. The thing seems impossible, and yet here we are, knowing that he did it. Well, maybe I'll find out to-night. h.e.l.lo!"

The door opened. Bobby from his hiding place could see Paredes on the threshold, yawning and holding a cigarette in his fingers.

"Here you are," he said drowsily. "I've just been in the court. It made me seek company. That court's too damp, Mr. Detective."

His laugh was lackadaisical.

"When the sun leaves it, the court seems full of, unfriendly things--what the ignorant would call, ghosts. I'm Spanish and I know."

The detective grunted.

"Funny!" Paredes went on. "Observation doesn't seem to interest you. I'd rather fancied it might."

He yawned again and put his cigarette to his lips. Puffing placidly, he turned and left.

"What do you suppose he means by that?" the detective said to Graham.

Without waiting for an answer he followed Paredes from the room. Graham went after him. Bobby threw back the rug and arose. For a moment he was as curious as the others as to Paredes's intention. He slipped across the dining room. The hall was deserted. The front door stood open. From the court came Paredes's voice, even, languid, wholly without expression: "Mean to tell me you don't react to the proximity of unaccountable forces here, Mr. Howells?"

The detective's laugh was disagreeable.

"You trying to make a fool of me? That isn't healthy."

As Bobby hurried across the hall and up the stairs he heard Paredes answer: "You should speak to Doctor Groom. He says this place is too crowded by the unpleasant past--"

Bobby climbed out of hearing. He entered his bedroom and locked the door. He resented Paredes's words and att.i.tude which he defined as studied to draw humour out of a tragic and desperate situation. He thought of them in no other way. His tired mind dismissed them. He threw himself on the bed, muttering: "If I run away I'm done for. If I stay I'm done for."

He took a fierce twisted joy in one phase of the situation.

"If I was there last night," he thought, "Howells will never find out how I got into the room, because, no matter what trap he sets, I can't tell him."

His leaden weariness closed his eyes. For a few minutes he slept again.

Once more it was a voice that awakened him--this time a woman's, raised in a scream. He sprang up, flung open the door, and stumbled into the corridor. Katherine stood there, holding her dressing gown about her with trembling hands. The face she turned to Bobby was white and panic-stricken. She beckoned, and he followed her to the main hall. The others came tearing up the stairs--Graham, Paredes, the detective, and the black and gigantic doctor.

In answer to their quick questions she whispered breathlessly: "I heard. It was just like last night. It came across the court and stole in at my window."

She shook. She stretched out her hands in a terrified appeal.

"Somebody--something moved in that room where he--he's dead."

"Nonsense," the detective said. "Both doors are locked, and I have the keys in my pocket."

Paredes fumbled with a cigarette.

"You're forgetting what I said about my sensitive apprehension of strange things--"

The detective interrupted him loudly, confidently: "I tell you the room is empty except for the murdered man--unless someone's broken down a door."

Katherine cried out: "No. I heard that same stirring. Something moved in there."

The detective turned brusquely and entered the old corridor.

"We'll see."

The others followed. Katherine was close to Bobby. He touched her hand.

"He's right, Katherine. No one's there. No one could have been there. You mustn't give way like this. I'm depending on you--on your faith."

She pressed his hand, but her a.s.surance didn't diminish.

The key sc.r.a.ped in the lock. They crowded through the doorway after the detective. He struck a match and lighted the candle. He held it over the bed. He sprang back with a sharp cry, unlike his level quality, his confident conceit. He pointed. They all approximated his helpless gesture, his blank amazement. For on the bed had occurred an abominable change.

The body of Silas Blackburn no longer lay peacefully on its back. It had been turned on its side, and remained in a stark and awkward att.i.tude. For the first time the back of the head was disclosed.

Their glances focussed there--on the tiny round hole at the base of the brain, on the pillow where the head had rested and which they saw now was stained with an ugly and irregular splotch of blood.

Bobby saw the candle quiver at last in the detective's hand. The man strode to the door leading to the private hall and examined the lock.

"Both doors," he said, "were locked. There was no way in--"

He turned to the others, spreading his hands in justification. The candle, which he seemed to have forgotten, cast gross, moving shadows over his face and over the face of the dead man.

"At least you'll all grant me now that he was murdered."

They continued to stare at the body of Silas Blackburn. Cold for many hours, it was as if he had made this atrocious revealing movement to a.s.sure them that he had, indeed, been murdered; to expose to their startled eyes the sly and deadly method.

CHAPTER III.

HOWELLS DELIVERS HIMSELF TO THE ABANDONED ROOM.

For a long time no one spoke. The body of Silas Blackburn had been alone in a locked room, yet before their eyes it lay, turned on its side, as if to inform them of the fashion of this murder. The tiny hole at the base of the brain, the blood-stain on the pillow, which the head had concealed, offered their mute and ghastly testimony.

Doctor Groom was the first to relax. He raised his great, hairy hand to the bed-post and grasped it. His rumbling voice lacked its usual authority. It vibrated with a childish wonder: "I'm reminded that it isn't the first time there's been blood from a man's head on that pillow."

Katherine nodded.

"What do you mean?" the detective snarled. "There's only one answer to this. There must have been a mechanical post-mortem reaction."

For a moment Doctor Groom's laugh filled the old room. It ceased abruptly. He shook his head.

"Don't be a fool, Mr. Policeman. At the most conservative estimate this man has been dead more than thirteen hours. Even a few instants after death the human body is incapable of any such reaction."

"What then?" the detective asked. "Some one of us, or one of the servants, must have overcome the locks again and deliberately disturbed the body. That must be so, but I don't get the motive."

"It isn't so," Doctor Groom answered bluntly.

Already the detective had to a large extent controlled his bewilderment.

"I'd like your theory then," he said dryly. "You and Mr. Paredes have both been gossiping about the supernatural. When you first came you hinted dark things. You said he'd probably died what the world would call a natural death."

"I meant," the doctor answered, "only that Mr. Blackburn's heart might have failed under the impulse of a sudden fright in this room. I also said, you remember, that the room was nasty and unhealthy. Plenty of people have remarked it before me."

Graham touched the detective's arm.

"A little while ago you admitted yourself that the room was uncomfortable."

Doctor Groom smiled. The detective faced him with a fierce belligerency.

"You'll agree he was murdered."

"Certainly, if you wish to call it that. But I ask for the sharp instrument that caused death. I want to know how, while Blackburn lay on his back, it was inserted through the bed, the springs, the mattress, and the pillow."

"What are you driving at?"

Doctor Groom pointed to the dead man.

"I merely repeat that it isn't the first time that pillow's been stained from unusual wounds in the head. Being, as you call it, a trifle superst.i.tious, I merely ask if the coincidence is significant."

Katherine cried out. Bobby, in spite of his knowledge that sooner or later he would be arrested for his grandfather's murder, stepped forward, nodding.

"I know what you mean, doctor."

"Anybody," the doctor said, "who's ever heard of this house knows what I mean. We needn't talk of that."

The detective, however, was insistent. Paredes in his unemotional way expressed an equal curiosity. Bobby and Katherine had been frightened as children by the stories cl.u.s.tering about the old wing. They nodded from time to time while the doctor held them in the desolate room with the dead man, speaking of the other deaths it had sheltered.

Silas Blackburn's great grandfather, he told the detective, had been carried to that bed from a Revolutionary skirmish with a bullet at the base of his brain. For many hours he had raved deliriously, fighting unsuccessfully against the final silence.

"It has been a legend in the family, as these young people will tell you, that Blackburns die hard, and there are those who believe that people who die hard leave something behind them--something that clings to the physical surroundings of their suffering. If it was only that one case! But it goes on and on. Silas Blackburn's father, for instance, killed himself here. He had lost his money in silly speculations. He stood where you stand, detective, and blew his brains out. He fell over and lay where his son lies, his head on that pillow. Silas Blackburn was a money grubber. He started with nothing but this property, and he made a fortune, but even he had enough imagination to lock this room up after one more death of that kind. It was this girl's father. You were too young, Katherine, to remember it, but I took care of him. I saw it. He was carried here after he had been struck at the back of the head in a polo match. He died, too, fighting hard. G.o.d! How the man suffered. He loosened his bandages toward the end. When I got here the pillow was redder than it is to-day. It strikes me as curious that the first time the room has been slept in since then it should harbour a death behind locked doors--from a wound in the head."

Paredes's fingers were restless, as if he missed his customary cigarette. The detective strolled to the window.

"Very interesting," he said. "Extremely interesting for old women and young children. You may cla.s.sify yourself, doctor."

"Thanks," the doctor rumbled. "I'll wait until you've told me how these doors were entered, how that wound was made, how this body turned on its side in an empty room."

The detective glanced at Bobby. His voice lacked confidence.

"I'll do my best. I'll even try to tell you why the murderer came back this afternoon to disturb his victim."

Bobby went, curiously convinced that the doctor had had the better of the argument.

For a moment Katherine, Graham, Paredes, and he were alone in the main hall.

"G.o.d knows what it was," Graham said, "but it may mean something to you, Bobby. Tell us carefully, Katherine, about the sounds that came to you across the court."

"It was just what I heard last night when he died," she answered. "It was like something falling softly, then a long-drawn sigh. I tried to pay no attention. I fought it. I didn't call at first. But I couldn't keep quiet. I knew we had to go to that room. It never occurred to me that the detective or the coroner might be there moving around."

"You were alone up here?" Graham said.

"I think so."

"No," Bobby said. "I was in my room."

"What were you doing?" Graham asked.

"I was asleep. Katherine's call woke me up."

"Asleep!" Paredes echoed. "And she didn't call at once--"

He broke off. Bobby grasped his arm.

"What are you trying to do?"

"I'm sorry," Paredes said. "Now, really, you mustn't think of that. I shouldn't have spoken. I'm more inclined to agree with the doctor's theory, impossible as it seems."

"Yesterday," Katherine said, "I would have thought it impossible. After last night and just now I'm not so sure. I--I wish the doctor were right. It would clear you, Bobby."

He smiled.

"Do you think any jury would listen to such a theory?"

Katherine put her finger to her lips. Howells and the doctor came from the corridor of the old wing. At the head of the stairs the detective turned.

"You will find it very warm and comfortable by the fire in the lower hall, Mr. Blackburn."

He waited until Katherine had slipped to her room until Graham, Paredes, the doctor, and Bobby were on the stairs. Then he walked slowly into the new corridor.

Bobby knew what he was after. The detective had made no effort to disguise his intention. He wanted Bobby out of the way while he searched his room again, this time for a sharp, slender instrument capable of penetrating between the bones at the base of a man's brain.

Paredes lighted a cigarette and warmed his back at the fire. The doctor settled himself in his chair. He paid no attention to the others. He wouldn't answer Paredes's slow remarks.

"Interesting, doctor! I am a little psychic. Always in this house I have responded to strange, unfriendly influences. Always, as now, the approach of night depresses me."