When a supporter for the mayor elect is found dead, Frank is put on the spot when the mayor wants him to position it to the public as a random act of violence.
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When three men attempt to rob a bank, Danny discovers that one of the perps happens to be a former cop.
When Danny shoots a cop who failed to identify himself, he is put on modified assignment and must face an Internal Affairs investigation, which delves into his personal state of mind that day.
Erin reopens an 18-year-old rape case, in which Frank was the arresting officer. Meanwhile, Danny and Jackie investigate the murder of three teenagers in a park, who seemed to have been killed for no reason.
Danny tries to juggle investigating a case while trying to have a romantic weekend with Linda.
Frank deals with a political crisis after Jamie and Renzulli enter a religious center in response to a 911 call and are injured by the church's security team who prohibits them from entering.
Jackie goes undercover as an escort when she and Danny track down a serial killer who is murdering prostitutes in hotel rooms.
When Erin's informant is murdered, she blames herself and works to help Danny discover who killed him.
When a young woman commits suicide, Danny and Jackie suspect it was forced.
Danny accompanies a dangerous ex-mobster who is helping him find bodies on cold cases in exchange for leniency for his son on grand theft auto.
Danny and Jackie investigate a murder scene at a diner, where a witness claims a uniformed officer fled the scene after shots were fired.
When a rich woman dies of a heart attack, her eccentric daughter claims that she received a message from God, who told her that her stepfather actually murdered her.
On the way home with his family, Danny hits a man with his car who is fleeing from a gunman, and his family gets caught in the crossfire when Danny fires his weapon at the gunman.
When a man's family is robbed and beaten in front of him, and the assailant is shot and killed, the Reagan's debate about how far they would go to protect their family.
When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state.
When Frank's close friend, a high-profile reporter, is almost assaulted while in town investigating a story, Danny and Jackie attempt to track down her would-be attacker.
As Erin prosecutes a woman accused of killing her husband, the defendant's attorney is murdered and Danny is assigned to the investigation.
Danny is put in a difficult position when a gun linked to a robbery is brought in to the NYPD's gun buyback program.
Danny causes waves in the department when he investigates a closed case, the suicide of a firefighter, at the insistence of the man's 12-year-old son.
Danny and Jackie are assigned to protect a key witness in a Russian mob trial, but when an attempt is made on her life, they realize there is a leak on the task force.
Danny and Jackie investigate the suspicious death of a high-rolling investor who sustained injuries in a fight, yet his hands are unmarked by trauma.
Frank must race to stop a biological weapon attack on New York City, while keeping it a secret from his family during their most sentimental holiday, Mother's Day.