When an armed robber with a history of murder resurfaces in Sydney, an under pressure Sergeant Gibbs and her trainee Charlie Fung race to catch him before he wreaks havoc across the city.

A four-part drama that follows two detectives as they set out to investigate a killer with whom they both share a history. The two feuding cops, experienced detective Grace Gibbs and trainee Charlie Fung, are called in when a share-house of international students, a pair of corrupt shop owners, a grieving widow and a gunman all collide, leaving one dead and another missing.

Stubborn but brilliant Detective Grace Gibbs is obsessed with avenging the murder of her junior officer. Charlie Fung, a new trainee detective blames his supervising officer Grace for the death of his best friend. Mani is a young Iranian medical student who is part of a crowded share house of international students. He is an off-the-books worker at an inner-city convenience store, run by greedy owners, . When a violet fugitive holds up the convenience store, Grace and Charlie are called in to investigate, setting off chain of events with devastating consequences.