Julian Sellinger finds his investigation for the murder of Felix handicapped after the return of kidnapping-denying Susanne Wichert while Isabell focuses on the photograph of her presumed dead father, leading to confrontations in Jena with her mother and back in Hessen with foundation president Maas. Designated state security chief Herbert Wichert stops at nothing to save his family and career, setting up Markus Dietze and Volker Jens to manipulate blame for the airport cop killing and Felix's murder before murder by sniper. Sellinger and Isabell must tie both cases together surprisingly, Maas's abuse of “Erlengrund“ as well as Felix's other enemies and paternity issues.