Adventure series about four kids who set out to solve mysteries of lost treasures which are connected to the Knights Templar: The Holy Grail, The Ark of the Covenant and The Snake Crown. The hunt for the treasures starts very peacefully with reading maps and solving riddles, but before they know it this turns into a dangerous game. The kids soon find themselves in grave danger as a dark brotherhood lead by the mysterious Isaksen is also looking for the treasures and they realize that they are on a race against time to get hold of the treasures and return them to their rightful owners before it’s too late.