A 32-year-old cop accepts a detective position with Internal Affairs, causing a rift with her family of cops.
Abby and her family must deal with the fallout when Richie shoots a teenage boy in the line of duty; Abby and Lina try to uncover a mob mole.
Abby and Lina investigate an ex-convict who is accusing the police of harassment; an Internal Affairs detective seeks information about Richie's case; Sheila visits the mother of the boy that Richie shot.
Abby and Lina investigate the coroner's office when a corpse goes missing and winds up featured in a viral video.
Abby and Lina investigate the murder of a stripper who was killed at a cop club house where Abby's father is a member; Richie finds out about Brody and Abby.
Abby and Lina investigate an officer who is accused of stalking his police psychiatrist; Richie's new partner challenges his loyalties and ethics; Abby's relationship heats up.
When a man collapses in front of her, Abby attempts to give him CPR; Donnie tries out for the SWAT team.
Abby and Lina stumble upon a murder investigation while investigating a crime scene photographer; Abby deals with memories from her childhood.
Abby and Lina investigate a fellow Internal Affairs detective; Brody seeks advice on how best to woo Abby.
Abby and Lina are sent to investigate when a young girl is trampled during a brawl at a wedding; Don recognizes Mackie's new man as someone with a shady past.
Abby and Lina investigate a complicated case involving the suicide of a police officer; Mackie and Abby's brothers plan a surprise party for Abby.
Abby and Lina investigate allegations of hazing at a police department recruitment academy; Don is wary of Sheila's decision to hire reformed convicts to work at the bakery.
Abby and Lina investigate Don's former partner; Lina worries that her relationship with Abby will change; a love triangle heats up.