A brilliant mystery series by bestselling author Enid Blyton, perfect for fans of the Secret Seven. Someone is sending malicious letters to the residents of Peterswood - but who is it? Fatty, Larry, Pip, Daisy, Bets, and the dog Buster must find the culprit who's making the villagers so unhappy. But Mr. Goon is on their trail to solve the mystery first! This edition, published in 1946, contains the original text and is without illustrations.