100 years ago, Charly & Co.'s school began a `time capsule' project. They buried the capsule under a tile in the school hall with a valuable newspaper inside. When Siggi prepares to open the capsule in front of students and press, they discover it has disappeared! Famous detective Bernard Saumel promises to solve the case. Charly says so will do his Agency. A challenge! Let's the best detective win. However, to make it more interesting, Saumel suggests solving the case in 24 hours.