The duo from the popular detective series gets their first serious job. The Hammurabi Contest stands a chance of becoming a great event at the school in Valleby. The prize is an ancient book containing the rules of solving disputes. Short before the contest starts, the book disappears in mysterious circumstances. Without the book, the contest will not take place! All the effort and dedication of pupils would be for nothing, and the school would lose its prestige. Jerry and Maja are involved from the very beginning, trying to find the lost book. Will the kids find the underlying cause of the case? A white dove will help them solve the mystery...

A beautiful waterfront house, a Swedish flag fluttering in the wind. A sailboat tied to the wooden deck below. This is the setting of the friends' annual Midsummer celebrations. The friends are gathered at Emil's family house and the herring lunch, sauna, games and compulsory skinny dipping are as always prepared. Expectations are set - Micke worries about his highly pregnant wife and the fastest way to the nearest hospital. Eva is looking for some distraction from her recent split with Patrick and Sam. Emil's college buddy from the States arrives with his own expectations of Swedish sin. Wannabe singer-songwriter Anders hasn't told his wannabe pregnant girlfriend Maria about his low sperm count and hopes to solve the problem over the weekend. To top it off Emil's surprise seems to lift the party to unprecedented heights. If everything had gone according to plan that is.