Mercy

Frank is put on the spot when a supporter for the mayor elect is found dead and Jamie goes on his first undercover assignment.

Danny discovers an attempted bank robber is a former cop, and Jamie rides with a new partner.

Danny accidentally shoots a cop and must undergo an internal affairs investigation.

Erin reopens an old rape case in which Frank was the arresting officer, while Danny and Jackie investigate the senseless murder of three teens.

Danny tries to not let a case get in the way of a romantic weekend with Linda.

Frank deals with a political crisis after officers are injured while responding to a 911 call at a religious center.

Jackie goes undercover as an escort to catch a serial killer, and Erin meets a potential suitor.

Erin’s informant is murdered and she blames herself for his death.

Henry suffers a heart attack Thanksgiving eve, and the Reagans deal with the thought of losing their patriarch.

Danny spends a day with an ex-mobster who helps him with cold cases in exchange for leniency for his son.

Danny and Jackie investigate a murder at a diner where a witness claims he saw an officer flee the scene after shots were fired.

A woman dies of a heart attack, but her daughter claims that she received a message from god saying she was murdered.

Danny’s family deals with the ramifications of being caught in the crossfire between him and a gunman, and Frank prepares to say goodbye to an old partner.

The Reagans debate how far they would go to protect their family.

When an undercover detective is killed in the line of duty, Danny makes it personal, as he searches for the killer.

Frank’s close friend, a high-profile reporter, is almost assaulted while she is out with him.

Erin and Danny face off in court when Danny is put on the stand in Erin’s murder trial.

Danny is faced with the dilemma of arresting a suspect who brings in a suspicious weapon in a gun buyback program.

Danny causes waves in his department when he opens up a closed case.

Danny and Jackie must protect a key witness in a mob trial after they uncover a leak in their task force.

Danny and Jackie investigate the suspicious death of a high-rolling investor and a hit is put out on Jamie.

New York City is threatened with a biological weapon and frank must attempt to stop it while keeping the secret from his family.