For police officers Lena Enzweiler and Said Rahman Nasheed, a routine call turns into a puzzling situation when they encounter a silent and unresponsive man walking along the shoulder of a highway at night. They take him to the station to establish his identity and try to understand what happened to him. Meanwhile, detectives Thomas Schwarz and Nils Jung investigate a suspected case of domestic violence after finding blood traces in an apartment building. The investigation quickly becomes more mysterious as they follow the evidence through the building.
