Flynn's old flame guides him deep into the world of body art, heroine and murder.

Chris suffers body blows when she is the forced to fight with her fists to nail a big time gangster.

Harris and Angie's son, Joshua, is abducted in a tragic case of mistaken identity.

Angie goes undercover to hunt down a serial killer who is praying on a popular tourist hotel.

Church risks radiation exposure in a desperate attempt to avert the detonation of a dirty bomb.

A stalled murder investigation forces Flynn to go undercover in a Middle Eastern consulate.

A domestic violence victim takes the law into her own hands.

A hitman target Chris when she investigates the sex murders of two teenage boys.

Luke Harris uses his bi-polar disorder as a cover to try and find a killer in a psychiatric clinic.

Apparently addicted to opium, Harris strikes a deal with a major drug dealer.

A revelation in a murder investigation suggests that the homeless are being exploited for snuff movies.

Harris goes undercover as a translator for a Malaysian drug cartel.

Betrayed by an old love, Church faces execution at the hand of a major drug dealer.

Angie Piper pursues a personal journey of revenge for the shocking death of her sister.

When a gay friend of Chris' commits suicide, Chris suspects he was murdered as part of a paedophile cover up.

Harris' complex relationship with his daughter threatens to implode.

Church hunts down a politically connected businessman importing cocaine.

Harris' opium addiction nearly costs him his life when he is exposed during an investigation.

Angie and Harris discover the shocking truth about their colleague, Megan Walsh.

Undercover as a hitman, Church is injured and suffers amnesia.

Accused of corruption and under investigation by IA, has Church reached his use-by date?

Flynn and Church are undercover in rival gangs when the city erupts into violence.

Angie goes undercover to bust a contract killer by posing as his long lost daughter.

The murder of an illegal immigrant leads undercover to a brothel trading in sex slaves.

Chris is involved in a car smash which leaves a young boys permanently disabled.

Harris' obsession with Angie's new partner spirals out of control when one of the Undercover unit falls victim to a serial killer.

Angie frantically tries to clear her lover's name while Harris works equally hard to convict him as the serial killer.