Tilly Devine and her husband 'Big Jim' own Australia's largest brothel network. Kate Leigh runs a ring of speakeasies all across Sydney. The rivalry between these two crime empresses will plunge Sydney into gang war.
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.
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.
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.