A sassy new operative arrives at the unit just as the group go undercover to entrap a group of young thieves. But a mistake leads to a kidnapping, placing everyone in danger.
Church goes undercover into the world of stolen art and must grapple with some of the conflicting emotions which have shaped his character and behaviour when he discovers that the target abuses his son.
A well-planned sting goes horribly wrong when Church infiltrates a criminal gang who are intent on robbing a very large bank. Following the operation, Mackenzie makes a decision to visit her parents.
Angie's assignment is jeopardised with the unexpected arrival of her sister; and Mac is faced with a dilemma when she discovers that Danni's involved with an associate of an underworld heavy.
Hollister asks Mac for help to capture the elusive Marty Stockwell, a master bank robber. He fatally shot one of Hollister's men, and now he wants revenge. So, Church and Danni go undercover to try and bring him to justice.
After three backpackers are murdered, Stone is sent into a hostel to investigate Evelyn Leigh, where his emotions nearly cost him his life. The death of Church's father gives him the opportunity to reflect on their relationship.
Mac and Church must infiltrate a neighbourhood residents group who are protesting the acquittal and return to the neighbourhood of a local teacher recently charged with the murder of a young student.
When Church strikes up an unlikely friendship with a hitman, after preventing him from killing himself, he is drawn into the middle of a heated triangle with no simple solution.
Mackenzie faces a dilemma when Detective Inspector Bill Hollister is revealed as a regular client at an illegal brothel which is the subject of a sting.
Mackenzie and Angie face an Internal Affairs investigation when an informant suicides, while Stone faces some important issues about his future in undercover.
