Grace, Annie and Tommy are growing up fast as police officers, but nothing can prepare them for the turmoil they face every day. It's a year since the fall of the McIntyre crime gang and the vacuum has been filled by rival gangs, all competing for dominance. Constable Shane Bradley is drafted in to help, but his motivations are unclear. Tommy is dangerously seduced by the world of intelligence policing, while Grace struggles to deal with her son's absence, and growing feelings for fellow officer Stevie. As a young loyalist threatens to take over the city, the officers face a major gangland feud β culminating in a violent and devastating confrontation.

A year into the job, the team are faced with a drug-fuelled crime wave that leads them into a loyalist estate. A violent clash puts Stevie and Grace's working relationship at risk.

A loyalist gangland feud turns up the pressure on the section. Annie makes an impetuous decision on a night out.

As tensions grow in Mount Eden, a response call forces Stevie to confront his past. Annie deals with the consequences of an impulsive decision.

Lee is the new boss in Mount Eden. Under pressure from Canning to get results, Shane leads Tommy into danger.

Annie's job is on the line. As Lee consolidates power, Stevie and Grace are thrown back together on a response call, with terrible consequences.

Mount Eden descends into chaos as Grace tries to get Henry out from under Lee's control. Happy finally learns the truth.