Stone and Angie investigate a murder linked to the porn industry; Mackenzie is shocked when she receives compromising photographs of her and Church.

The compromising photograph threatens unit security; an X-rated movie star disappears suspiciously.

Church works undercover to infiltrate a gang planning a significant robbery; Angie is assigned to pose as his girlfriend to support the operation.

Rocca poses undercover with Church on a gold smuggling case; Olivia becomes seriously ill.

After a cocaine bust, drug lord Justin Forbes seeks revenge; Stone goes undercover to infiltrate Forbes' operation.

MacKenzie goes undercover in prison to investigate a young woman convicted of murdering her embezzler husband.