Wild Chickens go with the class to a distant island in the hope of having a good time. It was not there: every day is clearly scheduled, and even the Pygmies break the peace treaty. The teacher tells the legend of a ghost that lives on the coast. The boys are sure that this is fiction, and they offer a bet: the gang that will be the first to prove that the ghost does not exist will win. But how to explain the mysterious footprints, night howls and ancient coins found on the shore? Chickens and Pygmies will have to team up to solve the mystery of the ghost resort...