Brian Miller is a devoted family man in his seventies, with a sinister secret; in the nineteen sixties, he murdered three people and got away with it. But Brian put aside his murderous ways, focusing instead on enjoying a happy life with his new young family. Many years later, a personal tragedy results in Brian's long dormant blood-lust to rise to the surface again, and the ageing serial killer is reborn, leading to a trail of death and destruction with an increasingly high body-count. Grandad Miller seeks revenge on all manner of victims, from a loutish fellow member of his local allotment, to a trio of violent muggers, from a former school bully who made his life a misery many years ago, to a feisty, ageing, hairdresser who has given his wife a disastrous perm down at the local salon. Will the lovable, homicidal grandfather be able to avoid capture by the authorities, or will his increasingly bad back put paid to Brian's nefarious ways for good?