"The favorite foursome from Třeskoprsk flies to the Pacific for a long-awaited vacation. But the carefree rest does not last long. The group is shipwrecked on an unknown island and must find their way back to each other, but also away. Who will they meet and who will help them in their difficult situation?

The adventure game Čtyřlístek in the shadow of the volcano is a continuation of the year-old game Čtyřlístek vs. Klamérie, in which Fifinka, Bobík, Pinďa and Myšpulín exposed cheaters at the winter games."