When a prisoner is abducted and murdered while on day-release, police embark on a massive man-hunt to find the killers. The 10-year investigation leads them to a ruthless underworld boss who is totally invisible to the police and the legitimate world.

Nine years after the death of Terry Falconer, the case against the Perish brothers appears doomed when Decker refuses to co-operate. Frank O'Rourke risks his life to testify against Anthony Perish.