Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

It started with a splash. Jimmy, a homeless veteran grappling with PTSD, did his best to pretend he hadn't heard it - the sound of something heavy falling into the Tyne at the height of an argument between two men on the riverbank. Not his fight. Then he sees the headline: Girl in Missing Dad Plea. The girl, Carrie, reminds him of someone he lost, and this makes his mind up: it's time to stop hiding from his past. But telling Carrie what he heard - or thought he heard - turns out to be just the beginning of the story.

Ruby Winter is surprised when her reclusive father invites a strange solider into their house. Intrigued, she tries to eavesdrop on their conversation, but is alarmed when she hears a fight break out. She dashes into the kitchen to save her dad, but he's not the one in trouble. The soldier has been stabbed and is bleeding out on the floor. Refusing her pleas to call an ambulance, her dad urges her to pack a bag—they have to run. As they try to escape her dad is shot and Ruby is chased by one of the soldier's comrades but is hidden by Lucas, a boy she has ignored up till now.

'Jesus Christ. I found one.' These words are blurted over the phone to Constable Snowy Lane, who is preoccupied with no more than a ham sandwich and getting a game with the East Fremantle league side on Saturday. They signal the beginning of a series of events that are to shake Perth to its foundations. It is 1979, and Perth is jumping with pub bands and overnight millionaires. 'Mr Gruesome' has just taken another victim. Snowy's life and career are to be forever changed by the grim deeds of a serial killer and the dark bloom spreading across the City of Light.

Nash Rankin is a disgraced cop trying to escape his past—his career was destroyed when he chose to take justice into his own hands. Now he's living a quiet life in a small town caring for the local wildlife and trying to stay away from trouble. Jesse Redpath has a new job in a new town, Satellite—the stormy weather that greets her first few days on the new beat seems like a sign for what's to come. A local has died in what seems like an accident, but Jessie isn't so sure that ‘accident' wasn't planned. All evidence seems to point to Nash, but Jesse's not sure about that either.