The Three Investigators, Doping Mixers

Sport normally leaves Justus cold. Especially when he's working on a new case. But what he experiences on the Rocky Beach High School sports field makes him suspicious. One of the boys training with Peter for the sports festival runs sensationally fast. And no sooner do the Three Investigators try to get to the bottom of the matter than the sprinter disappears. Victim of greedy managers or a cunning doping cheat himself? Who is involved?

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