The Summer Trackers. The Case of the Strange Sock

Cousins Martin and Markus spend their summer holidays at the family cabin. One day, they discover a mysterious inflatable raft and a sack of money on the shore. As the boys are big fans of detective stories, they decide to investigate the source of the money. This leads them on an exciting and dangerous journey, by the end of which the boys start calling themselves The Summer Trackers. When a costly painting disappears from a neighbouring mansion the following year, The Summer Trackers are called into action again.