“We’re anxious not to have taken up your time for nothing, sir,” explained Wally, suavely.

“H’m,” said Captain Garth, looking from one guest to another. “Mr. Linton, you look as pleased as any of them!”

“The family reputation for common sense is at stake,” said Mr. Linton, smiling. “I admit I don’t want to find they’ve led you on a wild-goose chase, captain. Besides, they woke me up; I want some compensation for a disturbed night.”

“A peaceful man, anxious to command a blameless ship, has a poor time nowadays!” said the captain. “Well, that’s how the matter stands. The cabins near the empty one are occupied by ladies, who, I think, are guiltless of anything desperate; they’re all addicted to wool-work and playing Patience. Further inquiry leads me to feel very doubtful about two men; one is employed in the galley, the other is a foremast hand. Both are Swedes.”

“But could they get into the cabin?”

“Oh, easily! Every one knows the plan of the ship, and there would be no difficulty in dodging into an empty cabin. Frankly,” said the captain, “it is a relief to me to find suspicion directed away from the passengers; it’s a much easier matter to tackle a foremast hand with alien tendencies. The sailor was seen last night under somewhat queer circumstances; he was in a part of the ship where he had no business. He gave a fairly lame excuse.”

“What time was that, Captain?” Jim asked.

“A little after three. It might mean nothing—but putting everything together, the matter is suspicious. We’ll set a watch to-night, in two places?”

“Can we be in it?” came from Jim and Wally, simultaneously.

The captain looked questioningly at Mr. Linton.