A London police officer goes undercover as a heroin addict in a small town and manipulates an unsuspecting local junkie into working with him for a dangerous drug dealer.A London police officer goes undercover as a heroin addict in a small town and manipulates an unsuspecting local junkie into working with him for a dangerous drug dealer.A London police officer goes undercover as a heroin addict in a small town and manipulates an unsuspecting local junkie into working with him for a dangerous drug dealer.