The Diamond Trail of Stockholm is the story of a diamond that disappeared from the old King of Sweden some two hundred years ago. The loss of the diamond was then covered up by the author Thomas Gunnarson who wrote a book about a monster hatching from an easter egg and somewhere along the lines the two incidents merged until the diamond was forgotten about. The Easter Demon was a mystery that then grew dorment for many years before Thomas Gunnarson's great-grandson Bjorn was found by his old schoolfriends. They did what they could to persuade him that there was a real diamond that was lost and after some persuasion he agreed to look for it. The group of five travel around Stockholm hunting for information and looking for clues that might tell them where to find the long lost diamond. All the while they're being watched by the police and agents that are also interested in recovering the lost diamond. Can they find the diamond?