When a light plane crashes at night in the midst of the New South Wales Snowy Mountains, Sydney Homicide's Detective Sergeant Pierce Ryder and Detective Constable Mitchell Flowers are sent to investigate what immediately looks like foul play.

As Ryder and Flowers investigate the crash they uncover a generations-old feud between two local families. Could the bitterness that has been carried through the years have anything to do with the death of the pilot?

Meanwhile, Detective Constable Nerida Sterling is already deep undercover in the Snowies, her assignment to infiltrate a drug ring operating in the mountains and to ultimately hunt down a murderer. As her cover becomes more and more tenuous, what lengths will Sterling go to in order to get the information that she needs?