Pettson and Findus are cleaning out the attic looking for old things they can give Henrik to take to the flea market. Findus comes across a wonderful ship-in-a-bottle which he definitely wants to keep, but Pettson accidentally puts the ship-in-a-bottle in the box for Henrik. When Pettson and Findus realise what’s happened, they rush out after Henrik but he has already cycled away. As they chase after him to get the bottle back, Henrik’s bicycle chain breaks and all of the objects fly into the air and crash down. Findus is very sad when he sees that the bottle is broken but then notices something that was inside the bottle… It’s a treasure map! Pettson remembers drawing it as a young boy when he buried a secret treasure.
