Josh rescues two children but then risks his career and puts the Tactical Response team in jeopardy when he takes his rage out on their father. The team is rattled by the unexpected arrival of new Inspector, Kerry Vincent. Although the team disapproves of Josh’s actions they close ranks around him, forcing Kerry to begin her own investigation.

The end of a long night shift finds Lawson, Grace and Dom in pursuit of a car driven by two lovestruck teenagers who have panicked after an attempted robbery turned to murder. When the teenagers are chased to a rooftop and threaten suicide, Grace steps up as chief negotiator and is forced to face the consequences of her inexperience. Michael, new to Tactical Response, encounters first-hand the tough reality of his job.

A gunman shoots Stella, who is saved by her bulletproof vest. Lawson realises the man is trying to commit suicide-by-cop. Putting his own life on the line in a face-to-face negotiation Lawson recognizes the gunman as his former mentor. While Stella confronts her brush with death, Lawson is forced to act against his beliefs and shoots, killing someone he knew well.

The Tactical Response Unit pursues a criminal who assaults Grace while escaping. Josh allows himself to be taken hostage. Preferring death to capture, the criminal forces Josh into a sadistic game of Russian roulette. Despite his ordeal Josh chooses to save the man’s life and convinces him to surrender. Grace’s injury causes her husband Connor to question her choice of careers.

The Tactical Response team faces a dangerous situation when an armed robbery turns into a siege with hostages in a suburban pub. Lawson and Josh surprise the robbers and are shot at when they arrive at the pub so they send Dom in as an undercover ambulance officer. Kerry and Lawson begin working well together for the first time.

When Grace, Josh and Dom investigate an activist attack at a research laboratory, firebombs explode, putting their lives at risk. Stella discovers that her brother, who is also a cop, is corrupt and reluctantly chooses to protect him. Michael faces his own mortality after being bitten by a monkey infected with a fatal disease.

Tactical Response attends a high-speed car chase between two teenagers from rival high schools that ends in a near fatal car crash. In a search for the student who caused the crash, the TR team arrives at a huge suburban party to find that a group of youths has stolen a handgun from a security guard. As Michael and Stella go in undercover to retrieve the stolen weapon, the party turns into a violent riot after a rival gang crashes the party.

After a prominent politician's daughter and her school friend are kidnapped, Kerry and the Tactical Response team must run a covert operation to safely recover the girls. They realize the girls have faked their own abductions to extort money from their parents to fund their dreams of becoming models in New York. However, the stakes become high when TR uncovers the agent's true identity and her plan to sell the girls as prostitutes.

After disrupting a carjacking, Lawson, Stella and Dom uncover an illegal vehicle rebirthing syndicate. But when their suspect flees, Lawson leads an adrenaline-fuelled car chase through an abandoned warehouse complex before the offenders are captured. Meanwhile Josh is forced to relive a horrific experience from his past when he, Grace and Michael are involved in a serious vehicle collision.

Tactical Response is called to a Media Building where a disgruntled man has locked himself in a room and is reciting erroneous articles published by the newspaper. When Dom uncovers a coded message, he realizes the building is a trap - the man has planted bombs. As the team works fast to evacuate the building and decipher the symbols, they are unwittingly led into a deadly explosion.

As Grace and Dom recover in the hospital, Lawson and Stella must deal with a suicidal ex-footballer, while Josh and Michael uncover a mysterious burglary attempt that leads them on a chase through a complex network of underground tunnels. At the hospital, Kerry works hard to hold the team together, but a sudden and unforeseen death takes TR by surprise.

A small-time suburban domestic dispute turns nasty and the husband flees the house leaving his wife unconscious and bleeding. Tactical Response goes after the man who is heavily armed and dangerous, a trained army sniper. Armed with a high-powered hunting rifle, the man is cornered on the roof of a high rise building. Lawson knows it will be almost impossible to talk him down.

When Tactical Response is called in to protect a high-profile underworld figure, Kerry knows the assignment is almost impossible. The man is being hunted by his gangland associates who have somehow managed to get inside information on the operation. After a series of sniper attacks, Kerry devises a unique way to protect the man.

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