The Three Investigators, Treasure in the Mountain Lake

A precarious situation for Justus, Peter and Bob: their sightseeing flight over the Swiss Alps ends abruptly with a crash landing. The pilot is unconscious, the radio destroyed. Suddenly a helicopter lands next to them. Armed men tie up and gag the detectives, and the three investigators must helplessly watch as the gangsters search the plane wreck. A little later they disappear again. The boys from Rocky Beach manage to get to safety. And then the gangsters come back…

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