Identity: An elite police unit formed to combat the explosion of identity theft.

From murderers who take over victims' lives and criminals who create personas to escape dark secrets, to impostors who look, talk and sound just like us but would kill in a heartbeat.

DSI Martha Lawrence fought hard to form the Identity Unit. Some call it her baby, others career suicide. Her gamble includes a handpicked team of experts with colourful personalities and forceful egos, none more so than DI Michael Bloom, an ex-undercover cop who knows what it's like to pretend to be someone you are not and how easy it is to lose yourself when living a lie; and the ambitious DS Waring, infuriated by, Martha's indulgence of Bloom's cavalier methods and suspicious that Bloom has a secret himself.

Martha must fight to keep the unit together as they unravel the psychology behind identity theft and resort ever increasing extremes to catch this Jekyll and Hyde.