As quick as lightning, Quest swung round in his place.
"He's fooled us again!" he exclaimed.

"Head her round, Captain--back to the _Durham_!" The sailor shook his head.
"We've lost our chance, guvnor," he pointed out, "Look!" Quest set his teeth and gripped the Inspector's arm.

The place where the _Durham_ had been anchored was empty.

Already, half a mile down the river, with a trail of light behind and her siren shrieking, the _Durham_ was standing out seawards..