Harriet Walker is a cop. She has it all, a loving husband and a promising career as a detective. But things go awry when her husband Matt, an undercover federal agent, is murdered. Within 24 hours, she has gone from detective to prime suspect and sets about burying her grief in her own private investigation. The painful search for details of her husband's death also leads to her confronting evidence of his infidelity. Together with new partner Joe, she must find her husband's lover to get to the truth behind the murder.

Harriet Walker is a cop. She has it all, a loving husband and a promising career as a detective. But things go awry when her husband Matt, an undercover federal agent, is murdered. Within 24 hours, she has gone from detective to prime suspect and sets about burying her grief in her own private investigation. The painful search for details of her husband's death also leads to her confronting evidence of his infidelity. Together with new partner Joe, she must find her husband's lover to get to the truth behind the murder.

The discovery of a blood-soaked four-year-old girl walking alone on the roadside leads detectives Hill and Walker to the scene of a bloody massacre that has left an entire family dead, save the young girl and her injured father. The investigation is particularly hard on Harriet as it takes her back to the recent murder of her husband Matt. To make matters worse, she has learned, second hand, that the DPP has consented to drop the murder charge against the woman accused of the crime in exchange for a guilty plead to the lesser charge of manslaughter. On the verge of a breakdown, Harriet must stay focused as she and her colleagues work to locate a killer.

The pursuit of a stolen car ends tragically when a police officer is killed after an iron bar is thrown from an overpass, smashing through the car's windscreen and piercing the driver's chest. The officer, Albie Borich, is an estranged friend of Theo, who must break the news to Albie's wife, who is pregnant with what Theo believes could be his child. The investigation of the case is difficult for Theo who roughs up Lenny Hunter, a man suspected of being the driver of the stolen car. Police suspect the accident may have been an ambush, targeting the policeman responsible for arresting Lenny's brother, but is all what it seems?

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.

A businessman is beaten to death on his morning jog. The man was newly arrived from Brisbane, coming down to oversee a corporate takeover of a marine salvage company. The small business is short on employees but long on people with motives: a secretary with claims of sexually harassment, an owner worried for his job, and someone responsible for embezzling thousands of dollars from the company.

A groom is shoot by a masked gunman at a lavish wedding reception, but despite all the guests, the detective's efforts are frustrated when no one will admit to seeing anything. Further complicating matters is an accusation that a police officer stole a large sum of money intended for the newlyweds — and evidence points towards Shane. Joe's receives an emotional blow when he learns his first wife has decided to move to Queensland to be with her new boyfriend, taking their daughter Ruby with her. To add to his woes, the seriousness of Nicole's relationship with Shane hits home when she tells him Shane has proposed. A friendly poker game yields a key clue in solving one of the crimes.

A star soccer player is murdered in an apparent robbery attempt on the club's offices. The slowly developing investigation upsets Hudson and nearly costs Theo his life when a surveillance job goes wrong. Joe's relationship with Kaz suffers a serious setback when his family responsibilities clash with her desire for a good time.

The skeletal remains of a missing teenage girl are discovered in the national park following a controlled burn, leading detectives into a series of fifteen-year-old missing persons cases. The investigation takes on a personal note for Hudson who is still haunted by the unsolved disappearance and presumed murder of another young girl. Information from a woman who was herself an attempted abductee leads to a suspect who is now dead, forcing Hudson to turns his attentions to the man's former girlfriend. Hudson is determined to get the woman to talk, but how far will the by-the-book sergeant go to get a confession?

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 Kingsway detectives investigate the brutal murder of a Filipino woman. They suspect the involvement of the woman's husband and possibly one or both of his parents but all parties have alibis and no one is prepared to talk. Sophie informs Hudson about her relationship with Theo.©

An older couple appear to be attempting to import heroin into the country when the drug is found concealed in their Thai holiday souvenirs. Are they just innocent carriers are were they trying to finance their retirement through drug smuggling? Theo is stabbed repeatedly with a syringe during a scuffle with two druggies in a car park. He wants to keep the incident under wraps but doing so requires him to distance himself from Sophie.

The Kingsway detectives are drawn into the medical world when an anaesthetist is found dead in a hospital car park. Was it a random attack or could malpractice have had something to do with it? Investigations soon reveal that the murder victim had many skeletons in her closet. But so too, it seems, do several of the other doctors and patients at the hospital where she worked. Meanwhile, having sworn Harriet to secrecy about being stabbed with a needle by a junkie, Theo is furious when she breaks his confidence.