second-in-command. He is Sandra's mentor on numerous occasions, having been her boss on the murder squad. Jack retired to care for his dearly-loved wife Mary, who had been the victim of a hit-and-run. He is still haunted by her death, partly because nobody was charged in connection with it, although in Series 4 it becomes common knowledge that Ricky Hanson was responsible. After being frustrated by Hanson's acquittal in his trial for attempted murder, Jack briefly disappears, but is found by Brian, and later returns to UCOS. Hanson is eventually charged with killing Mary and imprisoned. Jack still speaks to Mary's memorial in his garden, seeking her help with solving cases. A softly-spoken and gentle man, he nevertheless possesses a quick and sometimes violent temper that he unleashes on suspects, although he will often become calm when he has reached the endgame, further unsettling suspects to achieve a confession. Jack has little time for the internal politics of the force, and is openly disdainful of those who lie, obstruct or mislead the police. Jack later leaves, giving only a day's notice, claiming that he has decided to retire to France and does not want to provide his colleagues time to talk him out of it. Brian correctly deduces that Jack has a terminal illness, and only has a short time to live, but promises not to tell the others until after Jack's death. He returned as an illusion conjured by Sandra in series 10, episode 8 in the UCOS office, encouraging her in her decision to move on and broaden her horizons elsewhere. Sandra Pullman Detective Superintendent Sandra Pullman (Amanda Redman) (2003–2013): Born in 1961, Sandra is the original head of the unit, being the only current serving police officer – and at the time the only woman – in UCOS. Sandra was a high flyer in Greater London's Metropolitan Police Service until the shooting of a dog during a hostage rescue, which is a running joke during the early series. Her career consequently stalled and she is made to take charge of UCOS, initially against her will. Ambitious and competitive, she has sacrificed personal life in pursuit of a career and likes to be in control of every situation. A running sub-plot involves Pullman's unsuccessful love life, which is mostly shown as a string of unsatisfactory relationships and numerous failed efforts at romance, including an attempt at speed dating.