The three ??? Kids have won a trial course in cave diving. However, one diver is registered under a false name and secretly distances himself from the group. Justus, Peter, and Bob follow him and discover a treasure cave. Cassettes and CDs are a thing of the past. The tigercards are the new medium for audio plays, audiobooks, and songs for children: scratch-resistant and interference-free at a low price. The operation is child’s play: just insert the tigercard and the tigerbox Touch automatically plays the title. And the best part: once paired, the tigercards can also be used offline - for maximum listening fun on the go. The beautiful design and robust material make the tigercards a popular collectible for all audio play fans aged 2 to 12.