On the prowl at sea. Dan takes the rest cure. Dave springs a new trap for submarines. The sea duel. A submarine finish. Shore leave. Matthews of Chicago. With the British sea-dog. Dan has forebodings. A wonderful job.
The loiterer at the radio room door. The bubble trail. A face seen before. Bechtold does some German lying. Poison vapors. Mystery in a berth. Fortune is partial to the bold. A hot burn with acid. Saving words from a wreck. Use for a prize crew.
Bechtold bluffs. Dave unfolds the coming fate of the prisoner. The sheet that Dave saved. The drive against the troopships. Danny Grin feels proud. Looking for the th Division afloat.
The row at the stern. The glow on the sea. The lie passed. Ensign Phelps picks up the mystery. The chart-room conference. The work of a spy. Dave quizzes the accused. The search for evidence. On board the troopship fleet. Torpedo talk. The minute of signals.
Vanguard of troopship fleet. Dave swerves for battle. The soldiers feel better. Destroyers scurry to save. The biggest submarine fight of all. Big guns roar. In Periscope Lane. Shooting of the good old kind. Clean work. Playing upon the Hun gun-crew. Turning turtle. Listing the survivors. Extent of the American losses. Dan has some questions. Dave plans a ruse.
