On behalf of the devil

Riedl is buying doughnuts at the Rattlinger bakery when a confused woman with blood on her clothes appears. However, she is unharmed, and the blood is not hers. She is Magdalena Meier, who has escaped from a secure psychiatric ward. When Hubert and Girwidz bring the woman back, they find the clinic in a state of shock: a nurse has been murdered...