It's Election Night and an arsonist is setting fire to polling stations. Ray believes they have a military background given the devices used but is reluctant to believe the culprit, identified by an eye-witness, is fireman and ex-Falklands War hero Andy Smith who saved Ray's life.

Cast: Philip Glenister, Keeley Hawes, Dean Andrews, Marshall Lancaster, Montserrat Lombard, Daniel Mays, Joseph Long, Geff Francis, Joe Absolom, Henry Garrett, Katie Lyons, Robert Gwilym, Charlie Wernham