In "The Three Investigators and The Secret of Skeleton Island" the cult detective trio from Rocky Beach, California, fall into a breath-taking mixture of adventure, thriller, and mystery. Only by a hairs-breadth did they escape with their lives after the successful completion of their last case. Their adversary Victor Hugenay admittedly escaped, but right now Peter Crenshaw and Bob Andrews find themselves on vacation. And even their leader Jupiter Jones doesn't have to be asked twice, as Pete's father invites the youngsters to come to South Africa. Or to be more exact: to Skeleton Island, where he is helping the stinking rich Miss Wilbur in the construction of a new theme park. After they arrive, there suddenly is no time for sun-bathing, snorkelling, or even fun activities: a mysterious beast, the so-called 'Tokolosh', wreaks havoc and provokes fear and terror among the workers. One thing's for sure - this is a case for the Three Investigators.