It was early for turning in, and nearly all of the troops aboard were still on the mess deck. Ken got his things from his bag and went down the passage to the bathroom. The 'Cardigan Castle' had been a swagger liner until she was impounded by Government to act as troopship, and she was provided with splendid bathrooms.
Carrington opened the door quietly, and was feeling for the switch of the electric, when he noticed, to his great surprise, that a port hole opposite was open.
Needless to say, this was absolutely forbidden. In war time a ship shows no lights at all, and it is a fixed rule that everything below must be kept closed and curtained.
Before he could recover from his first surprise he got a second shock. A tiny pencil of light—just a single beam, no more than a few inches in diameter—struck through the darkness and formed a small luminous circle upon the white-painted wall above his head.
It only lasted an instant, then a dark figure rose between him and the open port, and instantly the beam was intercepted, and all was dark as before.
Through the gloom he vaguely saw the arm of the man who stood in front of the port raised to a level with his head, while his hand moved rapidly.
Instantly he knew what was happening. This man was signalling. Carrington had heard of the German signalling lamp which, by means of ingeniously arranged lenses, throws one tiny ray which can be caught and flung back by a specially constructed mirror. That was what was happening before his very eyes. A glow of rage sent the blood boiling through his veins, and forgetting all about the switch he sprang forward.
As ill luck had it, there was a wooden grating in the middle of the cement floor. In the darkness, he failed to see this, and catching his toe, stumbled and fell with a crash on hands and knees.
He heard a terrified yelp, and the man made a dash past him for the door.
But the door was closed. Carrington had shut it behind him. Before the fellow could get it open, Ken was on his feet again, and had flung himself on the signaller.