Hanson blames himself for failing to prevent the shooting death of his girlfriend in a convenience store robbery and becomes obsessed with revenge.

Hoffs and Ioki go undercover in a Guardian Angel-type street patrol whose members have a vendetta out for a drug dealer who Hanson is trying to set up for a bust.

Hanson becomes an inmate in a juvenile detention hall in order to investigate the murder of one of the inmates.

Booker goes undercover as a radio DJ to discover who killed a controversial college radio personality by planting a bomb in his car.