Lenny Milton is an unambitious officer whose best friend, Michael Love, is now head of the local force. But when Milton is forced undercover by the police complaints department to investigate allegations of corruption against his friend, he faces uncovering a truth he desperately doesn't want to learn. Meanwhile, the body of a young boy is found at the bottom of a stairwell, but Milton is convinced that his colleague, Singleton, is side-lining the investigation, and when evidence related to the case goes missing from his desk drawer, he suspects that it is not just Love who may be corrupt. Later, Milton arranges to meet one of his colleagues for a drink, but is caught off guard, and his drink is spiked. He awakes many hours later next to the dead body of one of his informants, who has been bound, gagged and strangled. Milton's colleagues refuse to believe his version of events, and he is arrested and detained on suspicion of murder.
Milton soon realises he is running out of friends as he becomes the prime suspect for the murder of his own informant, but in order to save his own career, he must finally force himself to discover whether his best friend is truly guilty of corruption.
Two years after the events of Tough Love, Lenny Milton has been transferred, but still finds that he is hated by his colleagues, who have branded him a grass. Meanwhile, when a friend of his Lenny's son dies during a heroin-related overdose, a drug-related gang war breaks out, and Lenny seizes his opportunity to re-ignite his feud with drug trafficker Barry Hindes.
Obsessed with bring Hindes to justice, Lenny ignores the advice of his colleagues as he sees a chance for vengeance.