Christmas and New Year have turned into a nightmare for Frankfurt and its environs: a high-class sniper, one by one, destroys relatives of people who want to avenge the loss suffered in the past by himself or those who hired him. The investigation is taken over by a police team led by a duo of outstanding detective professionals, Oliver von Bodenstein and his subordinate Pia Kirchhof. However, the farther, the more the case gets confused: the number of suspects grows along with the number of victims, the invited experts have directly opposite portraits of the killer, and the team plunges deeper into the dirty secrets of the organ transplant industry...