Are you a fan of The Three Investigators (Die drei ???) and eager to (re)discover their thrilling cases? This challenge invites you to read or listen to all of their adventures—from the classic mysteries to the latest releases!

New cases will be added as they come out, so you can keep solving mysteries with Justus, Peter, and Bob. Whether you're a longtime fan or just getting started, this challenge is perfect for anyone who loves suspense, clever deductions, and a touch of nostalgia.