The dynamic group of the Five Find-Outers reunites during the holidays, eager for new adventures. However, in Peterswood, there's absolute tranquility. Suddenly, various anonymous letters flood the village and expose many people. Who is hiding behind anonymity and what is on their mind? Inspector Goon takes on the case investigation, sidelining the active children. When the mystery involves many suspects and even more red-haired boys, it's time for Fatty to clear up the case…