When a series of shootings claims one of their own, Ronnie and Joe have little time to grieve - they must solve the case before the killer reaches their next target on a hit list that includes CPS director Henry Sharpe. It gradually becomes apparent that the common thread connecting all the names is the case of Mark Glendon, convicted of the murder of his wife four years earlier. Although he's still in custody, a retrial is imminent, putting pressure on the team to catch the murderer before the jury delivers its verdict.