 Katta (12), Jarle (15), Siw (14) and Sigge (10) are the forth generation Sterners searching for a treasure from the ship "Liljen" wich disappared near the sothern coast of Norway in 1806. To get help from their fathers to dive for the treasure, they have to prove they are made of the right stuff. They have to travel around Scandinavia to fish six different types of fish, from six different places in south of Norway, Denmark, Sweden, north- and mid-Norway. On their journey they learn to know more about them selfs and about the mysteries that lies buried in the past of their family...