Oscar Stone's killer is brought to trial in a situation of high security. The accused is represented by a high profile criminal barrister, Ingrid Burton. That and the presence of a mysterious Mr. Brown in court, has the police on edge.

When Church goes undercover as an armed robber, he is busted by a young cop, who so impresses Harris, that he arranges for her to join Undercover for a trial period. Meanwhile, the brutal murder of an old woman sees Danni go undercover as a carer in a retirement village.

Church's undercover assignment results in the kidnapping of a drug dealer's son. Meanwhile, Chris finds herself on what appears to be a routine surveillance job at a video store. It proves, however, to be anything but routine.

An undercover attempt to sting a drug distributor results in tragedy, with accusations made against an undercover operative.

Harris sends Chris undercover to infiltrate a violent gang of brothers despite Church's reservations about her inexperience. When Church realises that Chris has a longstanding relationship with a street contact who gets her closer to the gang, a window on Chris's former life begins to open.

A middle-aged woman, Helen, brings a cardboard box into police headquarters claiming it contains a bomb. In fact, it contains something even more bizarre, that is determined to belong to her husband, Miles. A series of mishaps prevents Angie from returning the box to Miles, and Ingrid Burton soon complicates matters when she reveals that she will represent Miles in his attempt to sue the police and Angie. Meanwhile, when Harris is forced to submit to a random drug test, another mystery comes to light.

Church's hapless persuit of the coke happy Vidarl crew takes a turn for the worst when most of them turn up dead - victims of a bloody armed robbery. There is, however, one survivor, but there's a catch.

Church goes undercover on a building site to investigate union corruption and the disappearance of activist Craig Shore. Matters are complicated when Ingrid Burton enters the equation. However, things take a surprising turn when Church and Burton discover they have more in common than they thought.

Harris puts Church undercover on the construction site where Ingrid Burton's client, Steer, was murdered. Meanwhile, Church is convinced that Harris is corrupt, and goes to extreme lengths hoping to prove it.

Church and Angie continue piecing together links between Conrad, suspected drug kingpin Stig Endquist and known union basher Rick Tyson. Church suspects Harris of protecting these men. Harris, for his part, suspects Church of corruption, and assigns Chris to spy on him, in an attempt to bring Church down. But the tables are turned when it is revealed that Chris has her own secret - and Church is the only one who knows the truth.

Harris is clearly losing it and is convinced that his officers are out to get him. In his paranoid state, he decides it's time to do something about Church - kill him. Meanwhile, Angie is having a hard time dealing with the intimacy between Church and Ingrid - the lawyer who got Stone's killer off the hook.

The cat is well and truly set among the pigeons when Church and Harris are forced to work together determined to catch two small-time dealers. Things get complicated when Chris, who knows nothing of Harris and Church's dilemma wants to set up a bust of her own.

As Harris' mental state continues to deteriorate, Church and Harris find themselves under extreme pressure to clear their names after drug boss, Stig Endquist, calls the Police Integrity Unit in to investigate the duo's involvement in a drug trade.

When drug boss Stig Endquist survives an attempt on his life, Church convinces him that the assailant was Stone's killer, Conrad. Endquist agrees to put out a bounty on Conrad in retaliation, and when Ingrid gets an inkling of what Church is up to, she threatens to expose him. Soon after, though, she is kidnapped by Conrad. The race is on, as Church faces a battle against the clock to find Conrad and discover Ingrid's whereabouts.