It begins with a message. Twenty-seven year-old Bella Carismo is only looking to help people. Working as a psychologist in her hometown of Williamstown, she wants to expand her private counselling practice. But those plans come to a screeching halt when she receives the first message. It comes from a person Bella doesn't know, but who is extremely interested in her. Soon she's bombarded with more emails and text messages that quickly escalate to vandalism and a physical attack on her life. With the harassment steadily increasing, Bella crosses paths with Marco Petrazini, a senior detective who might be able to help her stop the stalker. But Bella isn't the only one facing attacks. When a girl from Bella's past is murdered, Bella and Marco work together to solve the crimes, while trying to navigate their growing attraction to each other. As they fall deeper into uncovering the truth, they realise it could be more than either of them is willing to face. Despite how they feel about each other, with Marco on Bella's case, their budding romance is strictly forbidden. And every day that passes is one where the stakes are higher and the stalker grows bolder, resulting in a tragedy that shatters Bella's world. With more people turning up dead, her closest friends becoming targets, and the suspects piling up, Bella and Marco soon find that their lives, and the lives of those around them, are in serious danger.