Berlin, 2017: several young girls have been disappearing for the past fourteen years. Red ribbons show the police the way to their bodies, but there's no trace of the killer. One evening, internationally renowned philosophy professor and anthropologist Walter Lesniak is arrested on the suspicion of the murders in the presence of his daughter, Ann. 'Professor Death' becomes the headline of the tabloid press and Lesniak himself refuses to cooperate with the police. Ann is certain this is all some kind of mistake. And she will prove it. Yet, with the arrest of her father, she begins a journey into the unknown . . .