Bayliss and Pembleton continue to struggle with the Watson case. Bolander and Munch discuss ""iguana style"" and are called to check out the homicide of a victim that isn't dead, at least the first time they're called. While checking out some leads for the Watson case, Crosetti gives his theory on the conspiracy to kill Abraham Lincoln. Lewis wants to flood Memorial Stadium. Bolander expresses an interest in Dr. Blythe; Munch advises and sends flower's in Stan's name. Danvers needs a stronger case; however, Howard is frustrated with a dead end. Then the ghost of the victim leads her to the undiscovered proof. Tim attends Adena's funeral.

Bolander asks Kay if she would double date with him and Linda, to try to take the pressure off his first real date. A slain phone-sex operator is found clutching a note naming her boss as the perpetrator, Bayliss and Pembleton investigate. Munch has trouble dealing with Bolander's happiness, so he crashes the double date and makes everyone miserable. A man is shot to death over a pen at the library, Lewis and Crosetti investigate and find a man with a pen fetish. As Bayliss looks into the murder he begins to get involved.

A young man comes into the squad room and after getting their attention, tells the detectives that his brother has been shot. Pembleton is sued by the multiple personality serial killer, who states he violated her civil rights during interrogation; he is discouraged when the city agrees to settle out of court. Munch must attend an alcohol awareness seminar to meet a requirement for the bar. Lewis has ""love at first sight"" with a woman who makes models of crime scenes, but she has ""love at first sight"" when she sees Bayliss and he sees her. Later, they attend an art exhibition and have an unusual sexual encounter in her ""bed."" All is not well at the Felton household, when he returns home to a cleaned out house.

The entire squad is put on 24-hour surveillance when a mass murderer has been identified, isn't at home and doesn't know that they know. Gee debates leaving the squad in the midst of the stakeout, so he can attend his daughter's wedding in California. As the detectives rotate through shifts on the stakeout, the main topics of discussion are the homeowners and Bayliss' plans to leave the unit.

Lewis and Bayliss investigate a homicide at a boarding school. Gee goes to Frank's house to pick him up for a trip to the gun range. Kellerman wants the investigation into corruption in his old arson unit to move along, but he finds out that all the real guilty parties have made plea bargains. Frank's firearm test looked promising. The tiny little voice in Bayliss' head tells him that McPhee Broadman might be their suspect despite the fact that his mother is a powerful judge in Baltimore. A student comes forward and confesses to the student's killing; however, the detectives aren't convinced he alone was responsible. Frank passes the exam and can return to active duty, but as far as he is concerned the real test is in the box.

A slightly intoxicated man (driving with his wife) aggressively whips his car around a state-owned truck; the offended truck driver rams their car; their aggression results in a collision where both drivers die. The man's wife is in serious condition. Kellerman and Munch investigate this case. Falsone gets prepared for the final hearing in his bid for custody of his son. Meanwhile, the other detectives investigate the death of a man who made a mobile phone call from the coffin in which he had been buried alive. The coffin was buried in the parade ground of an old spy school. The victim might have remained alive if the lid hadn't been sabotaged to collapse. In the car / truck collision case, Cox's boss wants her to ""verify"" the results of the car driver's blood alcohol level to help protect the state from serious litigation. An old Russian friend of Gee's furnishes them with information that leads the detectives to the discovery of a group of men who couldn't make it as spies. (They cal