If you thought you knew the story of The Teacher's Pet, get ready to be shocked. Hedley Thomas takes you behind the scenes with a blow-by-blow account of one of the most intriguing and enduring murder mysteries of our time - the crime, the podcast investigation, the sexual exploitation of teenage students, the courtroom drama - and how justice was finally delivered.

Teacher and former rugby league player Chris Dawson appeared to have it all - a loving family and a beautiful home in Sydney's Northern Beaches. But in the summer of 1982 his wife Lynette disappeared and not long afterwards Dawson married a much younger woman, a former student. Less than a decade later this young woman escaped the marriage and went to the police to record her suspicions that Dawson had been involved in Lynette's disappearance. A homicide investigation followed but got nowhere until 1998, when Detective Sergeant Damian Loone was handed Lynette's file.

On February 13, 2017, two Indiana teenagers, Abigail Williams, 13, and Liberty German, 14, went for a walk in the woods near the abandoned Monon High Bridge. They never returned home.

In November 1987, a young couple on an overnight trip to Seattle vanished without a trace. A week later, the bodies of Tanya Van Cuylenborg and her boyfriend Jay Cook were found in rural Washington. It was a brutal crime, and it was the perfect crime: With few clues and no witnesses, an international manhunt turned up empty, and the sensational case that shocked the Pacific Northwest gradually slipped from the headlines.

These days, no one in America feels immune to violence. But now, in this extraordinary, groundbreaking book, the nation's leading expert on predicting violent behavior unlocks the puzzle of human violence and shows that, like every creature on earth, we have within us the ability to predict the harm others might do us and get out of its way. Contrary to popular myth, human violence almost always has a discernible motive and is preceded by clear warning signs.