When the winner of the city's Good Samaritan Award is murdered, Gee and his staff are called to help the new female night shift commander. Pembleton is at odds with the detective he shares a desk with. Beau and his wife separate and Kay gets caught in the middle. Meldrick and Munch have plans to buy a bar and try to persuade Bolander to also become a partner. Bayliss agrees to become a ""silent"" partner. In passing, Crosetti is said to be in Atlantic City on a ""shots, slots and sluts"" dream vacation.

The episode was rated 7.83 from 41 votes.

A convict is released from prison and begins to get his revenge on Frank by frustrating the investigation he is currently working on and also by terrorizing his wife.

The episode was rated 7.89 from 35 votes.

The church asks that the public know the details of the murders. Pembleton has an interesting time in the box with a witness who has multiple personalities and is shown to be the killer, but before he can get a confession, her lawyer arrives and later she confesses on television. Pembleton begins to question his faith. Bayliss becomes a not-so-silent partner. Beau spends some time with his family and decides to end his relationship with Megan.

The episode was rated 7.90 from 39 votes.

Beau meets Megan's cousin, NBC's Tim Russert. Kay and Stan return to duty, after Stan undergoes a final test, and Kay finds her desk has been moved. They like Beau, they both must get used to the job again. Tim and Beau investigate the discovery of a skeleton found buried in a backyard. Bolander and Munch discover an unlikely suspect in the murder of a quiet elderly couple: their grandson. Gee exposes Granger, who used his relatives in some department plumbing contracts; the information is leaked to the papers, Granger is forced to retire. Barnfather is made colonel and a new captain is named, Megan Russert. The higher ranks of the Baltimore police department are now more politically correct, but Gee doesn't like it.

The episode was rated 7.91 from 35 votes.

Pembleton receives an extradited prisoner from New York City Detective Logan. Bayliss is put in charge of investigating the death of Gordon Pratt, but gets no cooperation from anyone on the force. Beau wants to return to active duty. A woman recognizes Munch from an old picture that is hanging in an art gallery across from the precinct. To Munch's embarassment he discovers that an old girlfriend, who's a photographer, is displaying an old picture of him in the buff at her gallery showing. Pembleton and Meldrick investigate a random shooting of a woman, and they clash over where the weapon may have been fired. They also find a woman who's shot her boyfriend and stuffed him in the freezer. Beau accompanies Gee on an investigation and must come to grips with his inability to look at a dead body the same way.

The episode was rated 7.97 from 31 votes.

A 16-year-old murder case must be reopened when the daughter of the convicted killer holds Col. Barnfather hostage. Pembleton and Bayliss investigate an elderly man whose wife died of drowning in the bathtub. Gee and the newly appointed Capt. Russert clash over the handling of the hostage situation. Bolander, Munch, Howard and Felton must go to the archives to find the records of the case. Lewis meets a strange homeless man who's witnessed the suicide of a man who committed the original murder and the detectives race to overturn the previous conviction. A new ""old"" bartender tries to convince Munch to go with the latest rage, microbreweries. Bolander and Lewis try to connect the suicide victim to the man on death row.

The episode was rated 8.00 from 30 votes.

Bolander has a relapse. The detectives sound off to the local news about the shooting. Apartment 201 is opened up and the occupant, Gordon Pratt, is a gun freak who once tried to be a cop. Russert and Howard declare a truce. They find the shooter, but lack of a weapon gets him released; later he is found with a bullet in his head.

The episode was rated 8.00 from 33 votes.

Gaffney allows a possible murder site to be washed down which causes Pembleton to go off on him. Russert takes Gaffney off the case and Pembleton is made the primary. Things get more complicated as a second victim is found. Beau tries to decide between his family and his relationship with Megan and he confides in Kay; his wife tries to reconcile with him. Russert wrestles with the media demands about the case. Something from Bayliss' past comes out when they try to get the liquor license for their bar. Bayliss goes to the liquor commissioner to work things out. A collector of the macabre comes in search of the victim's white gloves. A third victim is discovered.

The episode was rated 8.00 from 37 votes.

Tim's cousin shoots a Turkish exchange student and his partnership with Pembleton may be in jeopardy when they both stand on opposite sides of the case. Lewis hires his grandmother to cook at the bar.

The episode was rated 8.06 from 31 votes.

Pembleton and Bayliss investigate the shooting of a young boy. During the investigation, the mother of the victim meets the mother of the shooter in the aquarium. The shooter shows no remorse for the killing, although he shot the wrong kid. Munch, Bayliss and Lewis can't remodel the bar when they discover it's been classified a historical landmark. Then when they find out back taxes are due on the building, which shuts them down before they open. Beau finds out his kids are in Upper Darby, Pennsylvania, so he goes to find them.

The episode was rated 8.08 from 38 votes.

The detectives continue chasing their only lead, the child molester. Munch is teamed with Stan's old partner. Beau has no feeling in his foot, but feels guilt about Kay's condition. Stan's ex-wife arrives in town, but has a hard time going to see him at the hospital. Barnfather and Granger want Russert to review Gee and see if he was negligent in his duties regarding the paperwork that led to the shooting. The pedophile is located and it is discovered he was responsible for the strangulation of a young boy, but not the shooting of the three detectives.

The episode was rated 8.11 from 37 votes.

Russert's old partner joins the homicide unit, but she suspects that he is taking his work frustrations out on his wife. Pembleton struggles with his pride and domestic life as Gee and Bayliss try to convince him to return. Bayliss is partnered with Lewis and on the way to the crime scene gets the ride of his life. Bayliss tangles with a reporter. Beau is in Philadelphia with his kids. The bar has its grand opening.

The episode was rated 8.16 from 31 votes.

The deputy commissioner invites Pembleton to lunch and gets him to investigate a case involving a congressman. Beau hires a private detective to find Beth and the kids when his clue that they are in Wilmington falls through. Howard and Felton investigate a case of a dead homeless man. Their job is made more difficult when they can't find the body. Lewis and Munch investigate the death of a motorcycle gang member. Pembleton finds out the truth, participates in the cover-up and then resigns when the media gets hold of the real story and the deputy commissioner doesn't back him up.

The episode was rated 8.25 from 36 votes.

Crosetti's body is found and Bolander is the primary and he thinks the evidence points to suicide. If it is a suicide, there will be no honor guard for the funeral. Refusing to accept the death as a suicide, Meldrick launches his own investigation and tries to thwart Bolander's investigation. Bayliss and Pembleton make arrangements for the funeral reception. Pembleton has reservations about going into the church for the services. Munch works with his brother, an undertaker, to arrange for a coffin. The preliminary ME report shows Crosetti had a blood alcohol level of .25 and wide variety of anti-depressants, The verdict: suicide.

The episode was rated 8.29 from 28 votes.

Bolander, Munch, Howard and Felton all meet to serve a warrant, but Bolander, Howard and Felton are shot in an ambush. Pembleton becomes the primary in the investigation and is partnered with a detective who specializes in the psychology of their prime suspect: a pedophile. Stan's ex-partner Mitch Drummond offers his help. Kay's father and Beau's wife and the kids come to the hospital. A clerical error is discovered to be the cause of why the detectives went to the door marked 201, instead of 210.

The episode was rated 8.34 from 32 votes.