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1第 1 集
Bolander and Felton are suspended for 22 weeks without pay for incidents related to activities at a police convention in Washington, DC. Howard plans to take the sergeant's exam. Pembleton and Bayliss are assigned to investigate the death of a body found at an arson. At the scene they meet an arson detective that clashes with Frank's working style. Frank hesitates chasing a suspect, and later we learn that his wife is pregnant. Munch also decides to take the exam, and when the wagering begins on who is going to pass, everyone favors Howard. While the detectives are debating whether the fire was set to cover the murder, another fire is started.
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2第 2 集
The fire investigation continues. Bayliss' back is acting up and Kellerman is paired with Pembleton. Kellerman shows Gee something, so he is offered a transfer into the department that he first rejects. Kay takes the sergeant's exam, Munch misses it due a ""comedy of errors.""
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3第 3 集
A gas leak causes the detectives to evacuate the building, so they relocate to an old bank building. Lewis is paired up with Kellerman on the murder of a woman. Sergeant Howard tries to carve out a place for herself with the other detectives, but her efforts prove unpopular. Pembleton has trouble adjusting to the new surroundings and his wife's pregnancy. A cameraman who was at the scene of the murder has who he thinks is the perpetrator on tape; however, when he brings the tape to Gee, he is thrown out before he can say why he's there. The cameraman eventually strikes a deal with Lewis and Kellerman.
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4第 4 集
The squad returns to the station. The FBI joins with the detectives to stop a ""thrill killer"" who's working his way north on I-95. Gee tries to reconcile with his daughter. The killer smells a rat at a roadblock so he bails out of his pickup. Everyone mobilizes to find him and when they do, the suspect in custody, while identical to the killer, claims he is innocent.
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5第 5 集
Pembleton and Bayliss investigate a murder that was committed in a gay neighborhood by skinheads and the victim's sexual preference is questioned. Brodie is hired by the department to videotape the detectives' crime scenes. A voice stress analyzer is brought in for a demonstration. Meldrick gets a lead and closes an old Crosetti case that even Howard couldn't crack; it causes a little tension between them.
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6第 6 集
Technically it's not a homicide; however, Pembleton and Bayliss investigate the ""murder"" of a small boy who's the victim of a stray bullet, which makes him brain dead. The parents must choose what to do with their son. The Pope is in town.
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7第 7 集
Lewis and Kellerman interview a suspect and uncover a 10-year-old crime, which is assigned to Howard and Munch. Tim lets Frank's secret about Mary's pregnancy slip out. Howard and Munch find the body from the 10-year-old murder bricked up in a wall. John has a date with Alyssa, the ME, but finds himself in bed with her new roommate before their date, so he begins avoiding her. Howard and Munch's murder suspect has a fascination for former Baltimore resident Edgar Allan Poe. Munch plays up that angle while trying to break their suspect.
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8第 8 集
Jay Leno stops by the Waterfront Bar while in town visiting his cousin Mary; Munch and Bayliss don't want to bother him. A new year starts out with a clean board and Brodie begins his work taping with the detectives. A sniper takes the city hostage, threatening to and executing people every 8 hours. The sniper uses Hangman as a way to leave clues for the detectives. Bayliss is the primary and his back is giving him trouble as he worries about surgery his doctor wants him to have. To combat the pain, he keeps taking muscle relaxants. A suspect is found and cornered and he shoots himself before they can take him into custody. Russert gets demoted when Barnfather doesn't like the way she handled the investigation.
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9第 9 集
The sniper continues the shootings and everyone returns to duty lacking sleep. The media starts to make their presence felt. Munch begins to worry about Howard's safety, fearing she'll be wounded again. Frank makes his wife wear a bulletproof vest. Gee asks for Russert's help even though Barnfather had ordered her to stand down during the rest of this investigation. A man at the scene of both of the day's shootings is put into the box for questioning. Russert has a talk with the suspect with the subject being keeping people's attention and respect.
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10第 10 集
Gee is sent upstairs to see Barnfather and everyone speculates about the vacant Captain's position. Lewis and Kellerman are sent to Pennsylvania to extradite a woman back to Baltimore where she is a suspect in the murder of her husband. Munch tries to find a videotape in Brodie's pile. Later after reviewing the tape, they discover a key piece of evidence isn't contained on the tape. Munch wants the tape erased, but Brodie delivers the tape to court and that results in the outcome Munch feared. On the trip back from Harrisburg, Kellerman convinces Lewis that they have time to stop at Neptune's Castle and they lose the suspect, for a moment. Later they lose her again but find her at the house of her dead husband's mistress, delivering a hat. Much to everyone's surprise but not the viewers Gaffney is promoted to Captain over Gee. Captain Gaffney lays down the law.