Seventeen year old Erica Campbell is sent to Norway to spend two weeks at Lake Skasen with her great-aunt. She is joined by two cousins she never knew she had. They discover that their great-aunt can no longer afford the upkeep of Villa Skasen which may have to be sold. It is left to the cousins to find the fabled buried treasure on Skasen Island and save the Villa . Their task is complicated by local superstition and myths of witches and lake dragons. A series of mysterious events place the three girls in danger. Their failure to find the treasure leaves only one option - they must rely on the old legend of Dragonmoon to save them...