When a series of shootings claims one of their own, Ronnie (Bradley Walsh) and Joe (Ben Bailey Smith) have little time to grieve – they must catch the killer before he or she can reach the next people on the hit-list.
And in first place on that list is Henry Sharpe (Peter Davison), head of the Crown Prosecution Service. The link between all the targets becomes clear - the common factor is the case of Mark Glendon (Mark Bonnar), put away for the murder of his wife four years ago.
But he's still in prison, though soon to be retried. However, the police struggle to find concrete evidence that connects Glendon to the shootings and the race is on the catch the killer before the jury delivers their verdict...
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