Tom Selleck stars as Frank Reagan, the New York Chief of Police. Frank's eldest son Danny is a seasoned detective, family man, and Iraqi War vet who on occasion uses dubious tactics to solve cases.
A good Samaritan with a police record takes action against a terrorizing subway criminal, forcing the Reagans to weigh the rights and wrongs of vigilantism.
The Reagans argue the advantages and disadvantages of profiling; Danny, Frank and the rest of the NYPD search for a homemade bomb about to detonate in the city.
After meeting with federal agents in a dark edge of Chinatown, Jamie witnesses a crime in progress and his suspect is killed while in pursuit. Now, Danny must solve the case in order for Jamie to avoid an Internal Affairs investigation.
Danny must delve into the family politics of the Russian mob while investigating the death of a gangster's son; Erin becomes involved in a high-profile corruption case.
When an assassination attempt is made on Frank's life, Danny goes on a hunt to track down the shooter and find out if the attack was random or by someone with a vendetta against the Commissioner.
When an unidentified young girl is found murdered at a debutante ball, Danny and Jackie look to the prostitute found giving her a hard time on the hotel's surveillance camera for clues. Meanwhile, Nicky gets a glimpse of her first murder victim as she rides along with Danny when he gets the call to investigate.
When a former U.S. Marine and war hero-turned-homeless man is found murdered, Danny, a former Marine himself, feels a personal connection and is determined to find the killer. Meanwhile, erroneous information about Frank running for mayor is leaked to the press.
Just before Danny is to give witness testimony at a Peruvian drug lord's murder trial, Linda is kidnapped. This drug lord has a history of intimidating witnesses.
Neighbors of the Reagans are murdered and their son becomes the prime suspect. Jamie is convinced he's being pursued by the Blue Templar when his gun goes missing.