And the deep blue sea by Charles Williams

In this tense maritime narrative, Harry Goddard survives a shipwreck only to be rescued by the SS Leander, a freighter harboring lethal secrets. The plot intensifies when a passenger, Colonel Egerton, is murdered by a fellow traveler named Krasicki, who claims the victim is actually a notorious Nazi war criminal. Goddard eventually uncovers a complex conspiracy led by the ship’s first mate, Eric Lind, involving faked identities and calculated assassinations to protect the fugitive's true persona. Amidst a growing cargo fire that threatens the vessel, Goddard and another passenger, Karen Brooke, are thrown overboard but manage to survive and fight their way back onto the ship. The story culminates in a violent armed confrontation on the smoke-filled decks as Goddard leads a desperate counter-attack against the mutinous conspirators. Ultimately, the narrative explores themes of survival, past trauma, and moral accountability against the backdrop of a doomed voyage.