A whole series of thefts shook the city! Unknown people somehow broke into several schools and stole the safes from them. The police can’t figure out how the intruders managed to get through the locked doors. But when they reached the Wilhelmina gymnasium where Winston’s friends study, the cat-detective was left with nothing to do but start investigating. Of course, it’s incredibly dangerous—after all, there’s a whole gang at work here! But Winston has super-brave friends! Kira, Tom, Pauli, and the four meowsketeers are already ready to track down the safe thieves.