When the sister of a murder victim from a case Ali worked on years before is found dead in an alleyway behind a strip club, Ali investigates the murder even though she's not officially on the police force.
Ali talks to a man about three kids who disappeared from a camp 30 years ago, when he was a counselor, and whose bodies were discovered 4 years later. When she goes to question him further at his residence, she discovers it is a mental hospital.
Len and Ali look into the death of a TV talent show contestant who collapsed while performing. Although her death was ruled the result of heart failure, an autopsy at the medical school reveals the cause of death to be poisoning.
A skeleton is discovered and is identified as the son of a friend of Andy's, a retired Inspector. Ali and Andy quickly determine the boy was working as a male prostitute. Ali is peeved when Ray lists her as a reference without asking her first.
After badgering Andy to give her a case as primary investigator, Samantha looks into the case of "Boxcar", a homeless man ruled to have died of "misadventure." Her case hangs on a "bum fight" video tape.
Ray shoots and kills a suspected cop-killer, and Samantha investigates the circumstances of the murder he supposedly committed. A defense attorney persuades Ali to testify in the retrial hearing of a killer she and her former partner helped convict.
Wanda takes Len to work, and he unexpectedly finds his bags packed in the trunk of the car. Steve Baker, a suspect in the disappearance of a teenage girl three years ago, requests police protection after someone shoots into his house.
After getting himself arrested while on a camp-out in the United States, Harper goes undercover to smoke out marijuana traffickers and in his discussions with the squad soon realises that minor dealers have been dying mysteriously. His objectivity is seriously challenged when he finds himself falling for Lila, the innocent sister of one of the main suspects.
After a taxi driver reports a passenger who seriously gave him the creeps with his misogynistic views on women, Ali decides to look into it, and the trail leads her to Ian Summerhill, a dentist who had dated the first missing woman and had been dating the woman found a couple of days after the cabbie came in. Sam tries to investigate Summerhill's dark side and heads back to her old work place, where girls entertain men for money. Ali's relationship with Paul is threatened when Ian shares some stories of Paul's mis-spent youth with her, and she wonders how accurate ...
While taking his daughter to school, Harper discovers a young girl's body in a box near her school. While he and Ali look into the case, Ali gets creepy cards from "a secret admirer." Sam investigates an abused woman's claims that her husband killed his previous wife in 1999.
Harper searches desperately for his missing daughter Kassia, praying that he will find her before it is too late. Sam has the perfect suspect, a well-known surgeon, but the only witness against him - his wife - is very unstable. Ray's dark side shows itself in dealing with the suspects. Ali makes the choice that will change her life forever.