"Likely. Don't see how else it would have got there."

"Have you no idea who the owner is?"

The lightkeeper wrinkled up his eyes shrewdly and stared at her. He removed the pipe from his mouth.

"I don't count a wide acquaintance among burglars and such, Miss Lorny."

"But-but it might not belong to a burglar!"

"Sure enough. Who do you cal'late it might belong to?"

"Oh!" she exclaimed. "I-I-why do you ask that?" Then, her eyes searching the highway in the direction of Clinkerport, she cried: "Who is this coming, Tobias?"

He turned from her to stare at the blue motor car approaching. He still held his pipe at a reflective poise, for Lorna's evident disturbance of mind had impressed him.

"Oh, sugar!" he murmured. "This here is Arad Thompson's car. You don't s'pose he's come to bring me and Heppy our money, do you? It 'ud please Heppy purt' nigh to death."

CHAPTER XXI

THE RISING TIDE OF DOUBT

Lorna Nicholet made no further comment, waiting anxiously for the big blue limousine to approach. Surely it would stop before the lighthouse.

It did. The door of the car opened. But the crippled Arad Thompson did not appear. Instead, a broad-hatted stranger in a rusty black suit stepped out of the car.

"That's Rafe Silver driving, as usual," murmured Tobias. "But who is this fellow? He ain't no acquaintance of mine."

The stranger came promptly to the lighthouse door. He glanced sharply from the lightkeeper sitting on the bench with his pipe to the young woman in the doorway, and back again.

"You are Mr. Tobias Ba.s.sett?" was his opening speech.

"I cal'late."

"Mr. Arad Thompson has sent me to you for some information."

"I'm chock-full of it," rejoined Tobias easily, putting his pipe between his lips again and waving his hand.

"Confidential information," continued the man, glancing again at Lorna.

"That's all right," said Tobias. "This young woman knows almost as much as I do, and a little extry information won't hurt her a mite. What was you lookin' to find out?"

"My inquiry is in regard to the robbery of the Clinkerport Bank night before last."

He threw back the left lapel of his coat with a practiced gesture, revealing a glittering badge pinned near the armhole of his vest.

"Oh, sugar!" murmured Tobias. "A real detective? I cal'late I'm pinched."

Lorna dropped a fluttering hand upon his shoulder, but then saw that the old lightkeeper was still smiling cheerfully.

"You fire ahead, Mister."

"Did you ever see this knife before you picked it up under the bank window?" and the detective displayed the toy in his palm.

"Oh, sugar! Can't say as I did. And yet I might. Seems to me-wal, I cal'late I better say no and be done with it. I can't somehow seem to place that thing," declared the lightkeeper, in deep reflection.

He did not notice Lorna's expression of countenance.

"I hope you will not withhold your opinion, Mr. Ba.s.sett," said the detective.

"You take it from me, Mister," Tobias rejoined grimly, "I ain't going to refuse any information that may lead to the recovery of the bank's money and the arrest of the burglars. Me and Heppy's got an eight thousand dollar interest in the robbery, as ye might say."

"You are prepared to help us, then, no matter who is. .h.i.t, are you?"

"I cal'late," agreed Tobias wonderingly.

The detective produced a little red-covered notebook from his pocket.

He thrust it toward the lightkeeper.

"Did you ever see this before?"

"I don't know. Can't be sure that I ever did. But, mebbe."

"This address book was found on a ledge right by the vault door. There seems to be no doubt as to whom it belongs, for the owner's name in his own handwriting is on the fly-leaf. Mr. Thompson is quite convinced of the ownership of the book, for there are specimens of the same handwriting on file in the bookkeeping department of the bank."

"My goodness!" gasped Tobias, staring at the book but refusing to take it from the other's hand.

"This book could not have been on the ledge where it was found at the time the bank closed day before yesterday. The vault door was opened on the combination. And the combination is written on one of the pages of this address book."

"Oh, sugar!" murmured Tobias. "Then you've just as good as got one of the burglars, ain't you?"

"Oh, no!" gasped Lorna, cowering in the doorway.

The men did not appear to notice her agitation. Tobias still smoked calmly. The detective hesitated for a moment before he fairly forced the red memorandum book into the lightkeeper's hand.

"Look at it," he said. "See that name on the front page? Do you know his handwriting?"

Lorna dared not look over the lightkeeper's shoulder. At first glance she had recognized the red-covered notebook. There might have been some doubt regarding the ownership of the penknife; but of the notebook-never!

"My soul and body!"

The pipe dropped from the lightkeeper's fingers and was shattered at his feet. He gave this no attention. He was staring, quite fascinated, at the flyleaf of the little book.

"Doesn't the knife belong to the same person?" asked the detective, with sharp insistence.