On limited duties pending an investigation into their last case, Detective Inspectors Major and Carver find themselves at an all-time low. So, when one of their own within SIU is murdered, Major and Carver become hellbent on solving the case and proving their worth. But it’s bigger than they thought... They discover they’re dealing with a twisted serial killer whose sights are now set on them. With lives at stake, they need to work together, but tensions run high and fractures in their partnership begin to worsen. Can they hunt them down before it’s too late?

• Daniel Mays
• Stephen Graham
• Anna Maxwell Martin
• Rosie Cavaliero