Beck 08 - Trails in Darkness

In Stockholm, a killer is working the subway, and the bodies he leaves have been decapitated. Martin Beck (Peter Haber) and Gunvald Larsson (Mikael Persbrandt), detectives on the same team, chase him while the city's panic keeps climbing. Morten Arnfred leaves the detectives in the dim tunnels, working by flashlight, the trains still running past them.