The Kingsway detectives are called in when the body of a young woman is found caught in a weir in a national park. It is learned the woman, a primary school teacher, was involved with a group of swingers, leading detectives to suspect the involvement of someone from within the group. The reported disappearance of another woman becomes a key element in allowing Joe and Harriet to solve the case. Despite his persistence, Sophie avoids Theo's overtures as she continues to keep details of her private life just that.

An old unsolved case that has dogged Joe for nine years is reopened when a young woman is drugged and assaulted at a local beach. The attack is carried out in much the same manner as the murders of two teenage girls nine years earlier, one of whom's necklace the new victim is inexplicably wearing. The suspect in those crimes avoided prosecution due to insufficient evidence but Joe is quick to tie in the new attack with the unsolved crimes and begins building a case against him. Tension mounts when evidence links the suspect to a missing person case, the latest victim falls prey to a suspicious accident that could prevent her testimony, and the investigation is hampered by mistakes that could destroy the case before it's even built. With the investigation unraveling, Nicole, whose ambitions to enroll in the Police Acadamy are in jeopardy thanks to an incident from her past, volunteers to go undercover, placing her life at risk to obtain a confession and ensure the killer's conviction.

The investigation surrounding the violent stabbing death of a pizza delivery boy takes an unexpected turn when the suspect brought in for questioning is found to be Ted Hudson's son Daniel, a paranoid schizophrenic.Daniel has been living on the streets off and on and has gone off his medication. There is physical evidence placing his at the crime scene and in questioning, he admits his guilt. It's a difficult situation for Ted as the secrets in his personal life begin to be exposed, including the breakdown of his marriage.

Theo and Nicole's evening out ends with an unexpected tragedy when Nicole is shot and rushed to hospital. With no reason for her to be the target of a contract-style shooting, the investigation is slow to develop. It is the discovery of a dead body at the bottom of a cliff that provides the crucial lead. The dead man, Lance Stiffner, was shot by the same type of gun that shot Nicole. It quickly becomes clear that Nicole was the victim of mistaken identity. The intended target was Nina Napolitano, who was having an affair with Stiffner. Her imprisoned husband found out and put out a hit on both her and Stiffner. The identity of the shooter is provided by a reluctant accomplice, and Joe and Theo are soon involved in a high-speed chase with their suspect. The chase ends when Joe draws his gun and shoots the suspect, believing to be in danger of being shot himself. However, upon searching the car, no gun is found. Was Joe mistaken or was it a case of cold-blooded revenge?

The police's Critical Response Team is brought in to investigate Lloyd Zuker's death. Theo lies about seeing Zuker with a gun to help Joe but his story doesn't hold up under scrutiny and lead investigator Frank Conti tries to get him to turn on Joe, threatening to charge Joe with murder and Theo with the attempt to pervert the course of justice. Despite the findings of Conti's report, Joe does have the Commissioner's support, but he's haunted by the shooting and is determined to find Zuker's missing gun and clear his name. Meanwhile, the detectives investigate the murder of a man whose body is pulled from a lake. Nicole comes out of surgery.

The investigation of a road rage incident leads to the discovery of an ecstasy importing racket. For Sophie, the focus quickly turns to her personal life when Eliot's father reenters her life, wanting the opportunity to be involved in his son's life. Seeking balance in her chaotic life, Sophie is tempted to let Dirk in but a shocking discovery puts much into doubt. Nicole is having second thoughts about her impending engagement to Shane.

A series of poisonings are linked to a local supermarket chain. Products at the store are being tampered with and demands have been made by an extortionist. The detectives' efforts to solve the case are hampered by the store's management who hope to keep the story out of the media, but it soon becomes too much for Joe who goes to the press to warn the public. Nicole rejoins her colleagues at Kingsway as Constable Brown.

Sophie and Theo cross the line from work partners to lovers but their budding relationship is threatened when they investigate a shooting, a case whose cultural overtones have Sophie questioning how serious Theo is about their future together. Joe and Harriet are sent on an overseas assignment to Tonga but the trip is not quite the tropical holiday Joe had envisioned.

The body of a young Asian girl is found in a garbage compactor, leading the Kingsway detectives to an international illegal prostitution racket.

The lives of two of Kingsway's finest detectives are in grave danger when Joe and Harriet are the targets of a terrifying car bomb attack outside the police station. While Harriet survives the blast, two uniformed policemen are seriously wounded. And things are about to get much worse for the crime-fighting duo as they continue their investigatation into the sex slave racket. Joe is devastated when an anonymous complaint is made against him, hinting at sexual misconduct with his daughters.