National Marine Fisheries Service agent Jackie Quiñones has a wrench thrown in her life when she uncovers a dead body on the beach, plunging her into an opioid ring investigation.

After discovering a lead on Sherry's murder, Jackie becomes determined to solve the case.Junior finds himself trapped, and Ray connects with his CI in ways that are unprofessional.

Jackie returns to rehab to help her investigation. Ray starts closing in on Osito at the same time he and Renee cross the line. Junior takes the first step to becoming a soldier.

Jackie finds out where Krista Collins is staying, but gets pulled back into her own life. Ray comes face to face with Osito. Junior tries to reconcile with Donna's family.

Jackie and Junior struggle to cope in the wake of a traumatic event. Ray's investigation picks up speed. Ray is there for Renee when she really needs him.

When Jackie realizes Junior's involved with Sherry Henry's murder, she enlists Ray and the entire CCINU to track him down -- before Frankie has him murdered. Renee finds herself deeply questioning her budding relationship with Ray.

Jackie and Ray try to return to business as usual after a depressing failure, only to learn the case might not actually be closed.

Jackie is white-hot to prove herself as a cop and avenge the death of her best friend, Junior. Frankie teams up with his cousin while Rays off the force because of Renee. Theres a new deadly drug in town, Great White.

Jackie abandons her stakeout for a firey confrontation. Ray is once again humilitated, and does what he can to get back on the force.

Jackie and Leslie get deeper into the case, and with each other. Someone will make a decision they will regret.

Jackie and Ray both realize a distressing truth. Frankie feels threatened and Renee proves herself to be ruthless.

It's the day before Thanksgiving on the Cape: things are looking up for Ray, and looking grim for Jackie. Frankie is filled with anxiety over his business with Jorge.

Renee risks everything to change her world around. Alan sets a trap that covers the entire Cape.

The whole “Great White” operation is cracked open, but a few mysteries remain. Ray’s plan to get his job back has a complicated ending. Jackie goes from feeling like a hero after an important discovery to the zero who let something critical get away.