Marcus Ashton is a law-enforcement officer who takes crime personally. He's committed and uncompromising in fighting it on the same streets where he grew up. After 15 frustrating years of low-level drug busts, he finally gets a chance to fulfil his dream of taking down the underworld's biggest players when he's recruited by the UNIT (Undercover Narcotics Intelligence Team). Using state-of-the-art surveillance, this top-secret squad hunts down and brings to justice society's most ruthless criminals. Bringing his best mate and work partner Tommy with him, Ash reports to Cartwright - a cool-headed boss whose strategic approach is the perfect foil to his all-action team. Joining them in the UNIT are the self-assured, tenacious Kim, measured problem-solver Martin, and Valerie, Cartwright's no-nonsense second-in-command. Stylishly shot and fast-paced, this series follows the team as they get ever closer to capturing their ultimate target, the cold-blooded crime boss, Roach.