A Jewish woman, Dr. Michele Wolf, interred in a Nazi concentration camp during WWII returns to her Paris home after the war's end. She's unaware that her husband, the handsome gigolo and chess master Stanislaw Pilgrin, has been having an affair with her stepdaughter Fabi in her absence.
A government team researching cures for plague find their results put on the Official Secrets list. One of their number is so incensed by this that he lets the maimed and jealous companion of a female colleague draw him into what, technically, could be a treasonable act.
In a French coastal town, Det. Dermot Kinross is inspecting the murder of antiques dealer Maurice Lawes, and the evidence points to Lawes's son, Toby -- and especially to Toby's bride-to-be, Eve Atwood. Eve's ex-husband, Ned, had his eyes set on something Lawes possessed.
Tom and Ellen are asked to perform as a dance team in England at the time of Princess Elizabeth's wedding. As brother and sister, each develops a British love interest, Ellen with Lord John Brindale and Tom with dancer Anne Ashmond.