A stabbing death has Danny investigating a voodoo community. Garrett discusses a dark secret with Frank. Jack and Sean head out with Erin and Nicky for some trick or treating.
Danny helps out Erin by playing bodyguard to her key witness after he's almost killed in a hit and run. Jamie and Vinny bust a drug operation.
Danny's on the hunt when a Malaysian drug lord takes a recently decorated NYPD detective as his hostage. When Henry goes on a ride-along, Jamie is introduced to other ideas about how to do his job.moreless
Danny and Jackie's investigation into a drive-by murder is reassigned when they are needed to protect a central American president who's been targeted for assassination. Jamie begins to question his new partner's methods.moreless
When two separate murder victims are found to be part of a group charged with gang rape, Danny considers the possibility that the same person killed them both. Erin faces off in court against her ex-husband Jack Boyle.moreless
Danny and Jackie investigate when an injured woman recants after making a domestic violence claim against a councilman, who also happens to be a friend of Frank's. Danny has to adjust when Linda goes back to work.moreless
A dangerous criminal that Danny put away seeks his revenge by kidnapping Jackie. Jamie gets a new partner. A young officer accidentally shoots an innocent man.
Unbeknownst to his family, Frank must deal with a potential biological weapon's attack on New York City as they celebrate Mother's Day. Danny and Jamie's long standing dispute comes to a head.
The death of a free spending and extravagant investor looks suspicious to Danny and Jackie. Jamie is placed under house arrest when a hit is placed for "Jimmy Riordan".
Danny and Jackie discover a leak in the NYPD after an attempt is made on their witness in protective custody. Erin has a chance to work with Frank when she's offered the job as deputy mayor.moreless
When a 12-year-old boy insists Danny reinvestigate the suicide of his firefighter father, his gut tells him to listen. Jamie's heroic actions at a building fire have him concerned his undercover work could be put at risk.moreless
A gun buyback program has a "no questions asked" rule but when a gun returned is linked to a robbery, Danny must decide whether to follow the rule or arrest the suspect.
While Erin is prosecuting a murder case, the defendant's attorney is murdered. Danny is assigned to investigate but things get tense when Erin questions Danny on the stand.
A high-profile reporter, who happens to be a close friend of Frank's, is in town and almost assaulted. Jamie's undercover case reaches a critical stage.