A missing child. A desperate father. A terrible secret.

Guido T has already confessed to two horrific child murders and led Berlin police to the bodies. The police are sure he is also the murderer of six-year-old Max, who disappeared without a trace a year ago.

But now the killer is staying silent. The investigators have no reliable evidence, so Max΄s parents have no certainty and are unable to say goodbye to their son.

Everything changes when one investigator makes an unbelievable offer: he can place Max΄s father, as a fake patient, inside the maximum security psychiatric hospital where Guido T is imprisoned.

Max΄s father agrees. He plans to force the child killer into a confession. Because nothing is worse than uncertainty.

Or so he thinks...