THE COURTEOUS CAPTAIN Vickers sprang back at that door as the sharp click of the turning key caught his ear, and Copplestone, preceding him and following Audrey, who had advanced fearlessly into the cabin, pulled himself up with a sudden, sickening sense of treachery.

The two young men looked at each other, and a dead silence fell on them and the girl.

Then Vickers laid his hand on the door and shook it.
"Locked in!" he muttered with a queer glance at his companions.

"What does that mean ?" "Nothing good!" growled Copplestone who was secretly cursing his own folly in allowing Audrey to leave the quay.

"We're trapped!--that's what it means.