Underbelly - Season 4 (2011)

Furious over Tilly's decision to kill Norman Bruhn, Kate sparks an all-out war by recruiting Tilly's prostitutes to sell cocaine.

Phil Jeffs faces the hangman's noose for a scandalous crime that has all of Razorhurst guessing.

Bill Mackay, newly-appointed Head of CIB, creates NSW's first-ever drug squad to crack down on street dealers. Meanwhile, a desperate Phil Jeffs gets aggressive with Kate, leading to one of the bloodiest street fights Sydney has ever seen.

Wally faces an uphill battle to protect Kate's business and family interests while she is in prison.

Black Aggie strikes up a romance with Greg "the Gunman" Gaffney and gives-up prostitution.

The Wall Street crash wreaks havoc on the gangs and a midnight attack on Barney Dalton and Wally Tomlinson has dire repercussions when one of the victims violates the criminal code of silence.

Frank Green is on trial for the murder of Barney Dalton. With Wally Tomlinson as the star witness, will he face the noose?

Tilly's decision to visit London has dire consequences for her business and marriage. With Tilly in London, Kate moves to seize control of the drug trade.

The ultra-nationalist New Guard are proving such a danger to his government that Premier Jack Lang guarantees Bill Mackay the new title of NSW Police Commissioner if he can stamp them out.

After a decade of gang warfare, Kate and Tilly have their final showdown.