A 12 year old case where a murdered woman's death matched the M.O. of a now-convicted killer seems to be yet another victim. Until investigation shows the killer couldn't have done it. He was already in prison.
While enjoying a day off, Ali receives a tip from a lawyer about Randy Benjamin, a young man who had assisted in the rape and murder of three men years earlier. Attorney-client privilege prevents him from saying much, but he points Ali to Stanley Caron.
While Ali and Logozzo investigate the murder of retired teacher, they are surprised to learn that, after a stroke, his behavior had changed drastically, and he'd gone from being a mild-mannered school teacher to a sex fiend who went to swinger parties.
When a man comes to the station with a box containing a blood-stained dress with a bullet hole, Ali and Tony investigate a possible murder on the college campus in 1964. They discover the victim wasn't who she appeared to be.
When a Chinese teenager is found hanging in a jail cell the morning after being arrested, Ali and Tony investigate the similarities with another jail cell hanging 20 years before, when the police department was being investigated for brutality.
Ali and Tony check out the story of an informant who claims he knows who killed a tow truck operator in 1991. Their case turns on the testimony of a woman who was a drug addict then, and who is now a hyper-religious housewife.
When a young woman claims to have a 17-year-old "recovered memory" of her sister's murder, the whole squad tries to sort through the family's secrets. Meanwhile, Ali attempts to get a confession from a terminally ill man long suspected of being a hit-man.
Firemen responding to a house fire find a child's picture displayed on a computer. Ali's attention is aroused when the child is identified as a boy who disappeared and was declared dead 15 years before, but in the picture he is older than when he disappeared.
After a body is found at a construction site excavation, Ali and Tony look into the case of an Anglican priest missing for two years. Simon asks Ali out on a date after accompanying her to an official function.
After reading a letter from a recently deceased hit-man, Ali connects the murder of an elderly woman to the murders of several informants used in a drug task force Simon ran in the 1980s, and finds out there is an leak within the police force.