When a supporter of the mayor-elect is found dead, Frank is put on the spot when the mayor wants him to position it to the public as a random act of violence. Meanwhile, Jamie goes undercover at a bar and meets a suspicious patron.
As Sherlock investigates an explosion that killed two people, he uncovers a crime that has been dormant for years. Watson wants Sherlock to choose a sponsor.
Alicia and Will work on the appeal of a death-row inmate accused of killing a police officer. Alicia swallows her pride and visits Peter in prison for information on the client, as Peter was the state attorney at the time of the client's conviction.
Alex is forced to abandon her idyllic life in Italy when Ryan persuades her to help him rescue Shelby from a notorious international arms dealer. Ryan and Alex recruit Owen and Harry to help rescue their friend.
The murder of a corrections officer leads detectives to a ring of abusive prison guards.