The triple murder of a couple running a restaurant and their son is reopened when it is revealed in court that the man who was originally charged with the crime was robbing a store at another location at the time of the murders.
The case begins when an abused wife alleges that her husband killed a girl in 1979 and produces a supposed snuff reel showing him possibly committing the crime. The team reopens the assumed murder investigation where an unnamed girl's blood splattered clothes were discovered in a trash can, but no body was ever retrieved.
Outside a prison, the bones of an inmate who tried to escape during the broadcast of Johnny Cash's prison concert in 1968 are found in an old underground escape tunnel. Suspiciously, that inmate was supposedly killed inside the prison at another time...
The team investigates the 1983 murder of an openly gay man who had been extremely active in attempting to stop the spread of AIDS. This included likely burning down a bathhouse where gay men were transmitting the disease and threatening to out closeted homosexuals who did not agree to petition congress for a solution. The early investigation also discovers that he was estranged from his prominent father who had kicked him out of his brother's wedding for bringing his partner along to the reception.
A headless corpse is found in the woods. The victim is identified and the ex-husband who used to assault his wife is charged with the murder. Later several similar corpses are found by the hounds; all the victims are women who disappeared in November and all were shot. While trying to find connections between the victims the team learns that all of them tried making denouncements for having been attacked but to no avail.
The team investigates the 2000 slaying of an up-and-coming Connecticut prosecutor who was about to try a high profile murder case. The early investigation discovers that prior to his death he seemed to have been heavily distracted by something.
A deprogrammer of sects victims is accused of murdered, so the sister of a teenager that committed suicide in 1978, treated by the same man, asks Lilly and the team for help: she now suspects that her brother could be murdered then, too. Besides, Valens receive devastating news.
A citywide incentive "guns for shoes" program causes a weapon to turn up that had been used in a 1987 drive-by killing of a little girl in a park. The team attempts to discover who had possessed the gun through the many hands it had since crossed while also investigating who may have been the intended target.
The early 1990's death on the railroad tracks of a mentally handicapped teenager is reopened. Drawings depicting the incident surface which indicate it may not have been an accident as originally believed.
The team investigates the early 1980's murder of a surgeon's wife. The husband had been convicted of the murder and was thought to have committed it for insurance money. The couple was under financial pain as a result of the doctor being sued for malpractice after he accidentally caused the death of one of the family's best friends on his operating table. However, new evidence found on a dead junkie with a past connection to the victim causes the case to be reopened.
Back in 1995, an alcoholic barmaid is found dead from a blow and exposure in freezing snow overnight outside the bar where she worked. She struggled to get her life on track including AA. There's plenty of potential culprits. This is a richly textured cold case and a good mystery.
An old truck is found in a river with human remains inside, leading the team to re-open the case of a girl who disappeared in 1932. When the girl's former best friend is interviewed, questions arise: just best friends, or forbidden love?
The discovery of nine human skulls leads Rush back to George Marks, the serial killer she was unable to incriminate months earlier, and who walked away a free man. As the detectives re-investigate his mother's murder from 1972, George is forced to emerge from hiding to face Rush again. This time, their very lives are at stake in their final showdown.