The Curious Affair at Heron Shoals. Augusta Huiell Seaman

American author Augusta Huiell Seaman (1879–1950) wrote her mystery novel «The Curious Affair at Heron Shoals» in 1940: Marty is a teenaged heroine, who lives in relative isolation with her grandmother and a mysterious parrot. But when a piano prodigy, the twelve year old Ted, comes for a visit, his interest in the mystery prompts Marty to start investigating.