Two Swedish girls have been found dead on the outskirts of Brussels. The circumstances surrounding their deaths point to a vicious trafficking operation and the Swedish branch of the Black Hearts motorcycle gang. When another girl disappears from the same area, A Unit sees a shocking pattern. Shortly thereafter, a suspected kidnapper is found brutally murdered and the connection to Black Hearts becomes even more puzzling. Is someone else behind it? The missing girl's fate now rests entirely in A Unit's hands. (Part 1)

The explosion is powerful and the devastation enormous when a subway train explodes in Stockholm's tunnel system on a November night. The country is in shock. A group calling themselves "The Holy Riders of Siffin" claim responsibility for the attack in an anonymous call that the A Unit manages to trace. They think they are close to an arrest. What they don't know is that this is just the beginning of a hunt framed by political extremism, hate and death. (Part 1)