Murder of 18-year-old brings two investigators together for the first time. A piece of evidence leads to a missing person case four years ago. Investigations were led by Irene Gaup, with old and new questions arising.

During building work in the city of Baden-Baden in 2015, an evil troll who was transformed into stone in the 15th century, is accidentally brought back to life. To prevent being unmasked, the Troll slips into the body of Vanessa and enslaves her. Vanessa Troll then goes looking for Charlie, the virgin boyfriend of Vanessa's daughter, as The Troll needs his blood to evoke a portal to a magical prison. Will the Troll's plans find success?