On "Dirty Thursday", the start of the Solothurn carnival, the corpse of a young woman is found at the Krummtower. A tattoo with the number 666 on the corpse leads Captain Dominik Dornach to a series of past murders in the Red Light District, where victims had the same tattoo. While Dornach investigates these first clues, his daughter, who works in Iraq for the UN, is targeted by terrorists. Everything that is important to Dornach seems to be threatened.

Christof Gasser belongs to a new generation of Swiss crime authors who have a completely new self-image and literary self-confidence. He advanced especially with his Solothurn crime novel series within a few years to become one of the most popular writers in Switzerland. The investigating team around cantonal policeman Dominik Dornach and Public Prosecutor Angela Casagrande is the centrepiece of his success. "Solothurn tanzt mit dem Teufel“ ("Solothurn Dances with the Devil") is the fourth part of this bestseller series and completes the series of four books around the illustrious duo Dornach/Casagrande. The story takes place in the not always peaceful cantonal capital of Solothurn, and also in Vienna, Paris and even in the Iraqi provincial city of Samarra and Amman in Jordan. Gasser shows in an original way how fatal a global network of international politics, organised crime and terrorism can be for the life of his protagonists. In his usual fast-paced and dense style, he tells an extremely impressive and current story, which shows how complex and relevant crime literature can be.