Diana McIntyre and her four boys have had a tough eighteen months but, with the love and support of her family, she believes their lives are finally back on track. Diana’s dream of starting a flower farm has been the perfect diversion, with an elderly dahlia expert showing her the ropes. She won’t have to do this alone. Locum pharmacist and single dad Ned Gardiner hasn’t called Victoria home for years. However, his father’s death forces Ned to return to the family farm, a place that holds few happy memories for him.

At police headquarters in steamy, tropical Darwin, a cop is brutally slain - right under the noses of his colleagues. The equally savage murder of select members of Darwin's legal fraternity follows, leaving investigating officers completely baffled. Is there a serial killer at large, and what connects the victims? These are the questions lead homicide investigator Russell Foley struggles with, while facing his own personal demons brought about by a failed marriage and the disintegration of his relationship with his best friend.

A summer of relentless heat. A local surfer named Ray Carlson is found dead in a house not far from Portsea back beach. There’s a silver-handled kitchen knife deep in his chest, and blood everywhere. Detective Sergeant Zoe Mayer is scarcely back from extended leave and still wrestling with her demons, but she is assigned the case, alongside her new service dog, Harry, whose instincts help her in unexpected ways.

Detective Rebecca Giles has just finished interviewing aging petty crim Sticky Pete over a spate of break-and-enters when a disturbing new report comes in. Twelve-year-old Kayleen Ellis has vanished from her home in Muswellbrook in the Upper Hunter Valley. Hours later, Giles is a local hero, having apparently solved Kayleen's case and the spate of jewellery thefts. Yet the hangover from her celebrations has barely kicked in when the body of young jillaroo Ava Emmerson is discovered in gruesome circumstances on a nearby farm.

The first drops start to fall when Quinn spies the body. With no reception and nothing but an empty road for miles, does she stop to help or keep driving to safety? Back at the iconic country pub where Quinn works, Andrea is sandbagging the place in preparation for heavy rains. Alone with her sleeping son in the back room, she reluctantly lets a biker in to wait out the storm. Out on the wet roads, tensions arise among four backpackers on their way to Darwin. They haven’t prepared for this kind of weather and the flooding isn’t the only threat on the horizon.