The Three Investigators and the Secret Key

Justus is puzzled. Three customers are looking for old Felix Kopperschmidt tin toys at Uncle Titus's junkyard. Then, the First Detective also gets his hands on an encrypted riddle message. His detective instincts are aroused! However, when Peter is attacked and Felix Kopperschmidt, the brilliant toy maker, disappears without a trace, it quickly becomes clear: the Three Investigators are in the middle of a new dangerous adventure! And they have to use all their detective deduction skills to put together the scattered puzzle pieces of this case correctly.

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