“Black Plumes” is a mystery novel written by Margery Allingham, a prominent British author known for her detective fiction. Published in 1940, the story follows the investigation of Albert Campion, Allingham’s recurring sleuth, into the murder of a wealthy art collector, Marcus Chesney. The scene is set at Socrates Close, Chesney’s country estate, where the eccentric family members and guests become suspects in the case. As Campion delves deeper into the secrets and tensions within the household, he uncovers a web of deceit, betrayal, and long-buried secrets. The novel is praised for its intricate plotting, engaging characters, and clever twists, all hallmarks of Allingham’s skillful storytelling. “Black Plumes” is a classic whodunit that keeps readers guessing until the very end.