Lukas (Marven Gabriel Suarez-Brinkert) and his friend Jan (Philip Günsch) witness the murder of three gang members in the forest. They themselves are in danger and manage to escape in time. However, they are certain: the killer is at large and knows about their existence. Although Jan grows up with the local police chief Helen (Nicolette Krebitz), he keeps what he saw to himself. Helen takes on the case together with her Munich colleague Corinna (Lana Cooper) and her new boss Roman Berg (Lucas Gregorowicz), a former undercover investigator. While the teenagers are in a turmoil of fear and shame and hope to escape with their lives by remaining silent, the unknown killer, in the midst of an impending gang war in Munich, decides to eliminate all witnesses.