With Ingrid missing for seven days, the intensive police search to find her begins to lose momentum with everyone beginning to believe they're looking for a body.
Angie is undercover in an Art Gallery looking for an insider connection to a spate of robberies when a balaclava clad bandit bursts in. The gallery manager is held at gunpoint while the rest of the staff are forced into the storeroom.
Harris attempts to teach a mate a lesson in crime and punishment, but his plan backfires with disastrous consequences. Meanwhile, news of Church's tape-recording implicating Ingrid Burton has been leaked to the papers.
Angie meets with two brothers, who are looking for a nurse to do a mysterious job. She's amazed when she's quickly hired by the pair and has to accompany them on the job immediately.
Angie, Harris and Sophie lose a colleague when a siege situation erupts at Police Headquarters. Special Investigations welcomes a familar face as its newest member.
Church embarks on his latest operation, infiltrating a Jewish crime family. But is the seasoned undercover operative going too far when he fakes the murder of a security guard to truly ingratiate himself with the family?
When Special Operations investigate a renegade young detective working subversively in a suburban station, they discover he has all the qualities to become the new undercover recruit.
New rookie Leo Flynn takes the undercover unit on a wild and merry dance, investigating a drug war between two rival ice cream vendors and ends up biting off more than he can chew.
Harris takes an impulsive trip to Singapore in an attempt to win Angie's heart and protect her from Internal Affairs. This plan backfires when she and her sister are taken hostage by a drug boss.
Angie's latent feelings for Church resurface when a young deaf girl arrives at Police HQ declaring she's his daughter. When Harris uses her to solve a crime, all hell breaks lose.
Special Operations and the Drug Squad simultaneously pursue a suspected European war criminal and her drug-dealing son, thwarting Harris and Angie's attempts to consummate their romance.
A sexual indiscretion of Harris' comes back to bite him on the arse when a demented woman sets her vengeful sights on Angie. While working undercover, church is hired to perform a hit on a colleague.
Flynn endangers his life and that of his pregnant sister on a deadly assignment with two cop killers. Church faces legal repercussions for taking the blame in the shooting death of Laurie Nicholls.
Sleeping with the enemy proves to be a dangerous cocktail for Church when he goes undercover in a dodgy furniture removal company to bust an interstate ecstasy shipment.
Leo goes undercover in order to bust a racehorse stealing, coke dealing porn king. Meanwhile Church has a surprise meeting with prostitute Lauren Davies.
Sophie takes Church to lunch with two of the state's biggest criminals. But will the meal be Church's last? Harris is blackmailed by an adversary from his past who threatens to reveal his psychiatric disorder.
While playing nanny to the daughter of a suspected hitman, Chris is horrified by the child's revelation. Luke grows increasingly agitated while dealing with his blackmailer's ever-changing demands.
Harris is blackmailed by an adversary from his past who threatens to reveal his psychiatric disorder. Meanwhile, Angie receives a proposal of marriage.
Angie faces an enormous decision regarding an aspect of her relationship with Harris and Chris' life is left in the balance when she rekindles an old relationship.
Eight months have passed since we last caught up with the Undercover Unit. Chris has pulled through and almost completed her rehabilitation. She has moved in with Leo, who has helped greatly in getting her back on her feet.
When a surveillance target unexpectedly collapses with a heart attack, Church is forced to step into his shoes as a hitman in a desperate attempt to save a kidnapped girl.
Church's efforts to nail a high profile people smuggler are thrown into chaos by a rogue Homicide detective hell-bent on playing undercover cop. Angie reconsiders her future in Homicide.
Drug dealer Charlie Sanderson tries to romance undercover officer Chris at a buy bust. Charlie offers to act as an informant for the police in his father Ned's drug organisation. But he has a condition -- Chris must go on a date with him.