The question remains - did Gene hunt kill Sam Tyler? Alex needs to know and all is revealed in the final episode. Meanwhile the rest of the team are dealing with a Jewelry robbery and triple homicide: diamonds are missing and the bodies of three gang members have been discovered. Things don't help with Jim Keats stirring up trouble as usual between team members.

Cast: Philip Glenister, Keeley Hawes, Dean Andrews, Marshall Lancaster, Montserrat Lombard, Daniel Mays, Grace Vance, Thomas Lockyer, Tony Marshall, Stuart Hall, Jon House, Geoffrey Streatfeild, Mason Kayne