Treasure hunt on the Elbe! When Benno, Georg, Jan, and Jutta secretly set off with an old sailboat to uncover a long-forgotten treasure on one of the many uninhabited islands, they become embroiled in increasingly adventurous events. Armed with numerous maps and an additional special mission from the King of Albania, they even encounter a few trigger-happy crooks along the way. But that's not all: off Pagensand, the four suffer a shipwreck and suddenly have to fight for their survival completely on their own. That's when they make a fateful discovery...