The Dark Ocean
Jack Vance
 Betty, an attractive California girl, takes a coming-of-age sojourn, embarking from San Francisco on an Italian freighter bound for ports in El Salvador, Panama, Venezuela, Spain and Italy. There are about a half dozen other passengers, including, to her dismay, Tom, an old boyfriend who infuriates her by introducing himself as her "fiancé", a notion of which she immediately disabuses both him and her fellow passengers. Betty develops an attraction for and engages in a mild flirtation with Mik Finsch, an older, mysterious man-of-the-world, but when she accepts an offer of drinks in his cabin, his amorous advances get way out of line and Betty find herself hard put to fend him off. Tom bursts into Finsch's cabin and the two start fighting; by the time the captain breaks them up, Tom has thrashed Finsch, who claims he was "just warming up". Betty tells Tom she could have handled the situation herself and she still has no interest in marrying him and wished he had not come. Another passenger tells Betty that Finsch's pride has been wounded and he will get revenge on Tom somehow. That night, Tom goes missing and a typewritten suicide note is found. There are suspicions, but no proof. When another "suicide" involving Finsch and the beautiful wife of a shipping agent leaves no doubt in Betty's mind that Finsch is a murderer, the two are pitted against one another, with Finsch seemingly holding all the cards.