Harvard Law School graduate Jamie Reagan's family, patriarch grandfather Henry's cop dynasty, proudly attends his graduation from the New York police academy, presided over by his father, chief commissioner Frank Reagan. Jamie's brother, Iraq veteran Danny Reagan, cleverly makes the best of his sole clue, a prototype doll, to find and liberate kidnapped Latino girl Teresa Campos. Alas, Danny blatantly breaks procedure, violating prime suspect Donald Banse's rights. A conviction thus seems impossible to obtain for sister Erin, in the D.A.'s office, unless new, …
The Reagans weigh the rights and wrongs of vigilantism when a good Samaritan who has a police record takes action against a terrorizing subway criminal.
Although initially skeptical, eager beaver Jamie proves a quick student again when his laid-back beat cop mentor claims simple observation is about the best tool to catch criminals. The third of three NYU campus rape victims hands enough evidence for Danny to make Argentinian deputy consul Claudio Calso's son Sebastian, a college buddy of her fiancé Blake Woods, his prime suspect. Diplomatic immunity isn't waved, which remains a problem even after Frank sneakily gets inadmissible DNA evidence.
After a passing-by uniformed cop is shot trying to stop a diamond hold-up, and manages to shoot one of the robbers, the NYPD mobilizes out of any proportion and feels custom allows, even dictates, taking extreme liberties with defendant rights and procedure, rather condoned by the D.A.'s office. Starting from the corpse and a cable working ‘coincidentally’ blocking view on the inly security camera, Danny soon works out, repeatedly abusively, its was the work of some crime family defendants. While patriarch Henry Reagan still relies on the unwritten understanding with …
An intercepted Arabic e-mail, presumably to Al-Qaeda, from US-born Khalid Hassan, Muslim convert name of Steve Haas, son of a Jemeni immigrant, and ingredients found in his home suggest he planted a large bomb with nails somewhere in Manhattan. Even Jamie and his mentor, who shows him silly advertising suits make ideal crime covers, are kept in the dark as Frank convinces the mayor not to risk a panic by going public without specific information. Danny once helped Steve as terrified abuse victim but can't trough to him and suspects discrimination drove him to …
Three pupils of father Leo's prestigious Catholic high school St. Angelo's die from drug use at a party, hosted at home by classmate Caitlin Breyer. Jamie is able to save fourth used Carol Hoffman's life by mouth to mouth. It seemed an OD, then a bad designer drug. When known dealer Wayne Foster is arrested, after denunciation by school pusher Billy Romero, identified with some help from the archbishop after a talk with alumnus Frank, the lab shows the rest of his batch is clean. Danny must find a more personal motive, especially after his victim survives another …
Latino street gang lord Pablo Torres is too careful to be prosecuted for his crimes. So Danny and Erin hope to get to him via his ‘kid’ brother, second chance education teacher and chief Esteban, a brilliant mathematician. The doubly immoral blackmail fails, but Pablo is murdered. Jamie protests when on top of customary hazing, at his age much more unruly, hence paternally spanked Danny reproaches him turning down grandpa's now illegal bludgeon. The mayor and his challenger, popular present D.A. Charles Rosselini, both want chief Frak's election support (at least …
When Jaime goes to meet Anderson, he comes across what he thinks is a crime. When he approaches them, they start shooting at him and shoots back. In the end someone is killed. Danny shows up and tries to find out what happened but no one is willing to talk. Eventually they learn that a Chinese woman is being sought by the Triad.
Three major offenders are released due to forensic failures in the understaffed police lab. Among them is serial rapist-killer Dick Reed, who enjoys a fan club and seems to bode revenge on the Reegans who got him arrested. After his MO is used again, the evidence doesn't point to him. Only Jamie maintains total objectivity, while wondering about FBI Agent Anderson.
King, the star bouncer of New York's hottest night club, is shot shortly after denying Wall Street youngster tycoon Lemon entry. Danny braves his wife's jealousy to investigate to foxy owner Sabrina's potential motive, only to find it was a ricochet, so King wasn't the target. Jamie is puzzled by another meeting he presumes intended to recruit him for the Blue Templar case and finds his father supportive after telling the job cost him his fiancée. Chief Frank finds old friend Jimmy Burke's candidacy for a career end promotion goes utterly wrong.
The discovery of a knave's corpse, walled in a building near his home for 20 years, inspires Frank, who couldn't solve the disappearance case then, to use all his present means, taking charge in person once more, at the expense of more political priorities. Jamie meets haughty forensic expert Sonny Malevsky, who also worked with and on the case of his late brother. Danny handles the case of a murdered luxury call girl with at least one ‘too exclusive’ client.
When the son of a Russian gangster is killed at his own engagement party, Danny delves into the world of the Russian mob and the family politics that exist. Meanwhile, Erin is thrown into a high-profile corruption case.
When an undercover counter-terrorism agent is shot, Frank assigns Danny to the case because he is the only officer he can trust given the victim's involvement with infiltrating a sleeper cell; however, Danny is sworn to secrecy as to not disrupt the police activity in that cell.
When a young girl is kidnapped and held for ransom, Danny and Jackie place her drug-addicted boyfriend at the top of their suspect list. Meanwhile, Erin and her boss, Charles Rossellini, take their flirtatious banter a step further.
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.
While investigating the murder of a homeless man, Danny takes a special interest in the case because the man is a decorated Marine. Eventually he learns that three wealthy men were the ones who killed him. While he gets one of them to admit to what happened. The other is protecting the other one who was the one who had no remorse about killing him. When the man is released due to lack of evidence, Danny places his career on the line to get him. And Frank learns that someone leaked to the press he is considering running for Mayor which he is not.
Danny witnesses a murder. He identifies the man and learns that he is the leader of a deadly gang. When the man is arrested he warns Danny the risks of testifying against him, Danny ignores him. But when Linda who's suppose take into protective custody is taken by gang, Danny tries to find her before he has to testify.
When Linda's runway model niece and a reporter both collapse at a fashion show, Danny and Jackie immerse themselves in the cut-throat world of fashion to find the culprit who poisoned them.