It's all fun and games at a raucous teen party until two people are brutally attacked with a pair of scissors and the Major Crimes unit has their hands full picking the culprit out of the crowd. Provenza meets someone who will change his life.

There is a miscarriage of justice when a gang banger is acquitted of murder and released from custody. Sharon's ex-husband, Jack Raydor represents the suspect in a subsequent murder. Rusty takes a chance when the guy he has a crush on visits the station.