An ancient legend of a Viking treasure trove is the starting point for the first season of the suspense series TRIO. Despite the fact that countless treasure hunters have disappeared whilst attempting to track down the so-called Odin's Gold, the three friends Nora, Lars and Simen set out on a thrilling adventure around the mountain village of Skjåk. Their perseverance, ingenuity and physical prowess make up for their youth, and in addition they have a tool their predecessors didn't have, namely state-of-the-art computer technology. Lars, who is wheelchair-bound following an accident, has acquired an extensive knowledge of computers and hacking, and this puts the trio at an advantage in the treasure hunt.