She's chasing a killer. He's watching her every move.

He hides in the shadows, waiting for the perfect moment. Each kill is calculated, planned and executed like clockwork.

Struggling to balance her personal and professional life, young DS Becca Vincent has landed the biggest case of her career-and she knows that it will make or break her. But she can't catch the culprit alone. Together with facial recognition expert Joe Russell, she strives to get a lead on the elusive murderer, who is always one step ahead of them.

Time is not on their side. The body count is rising, and the attacks are striking closer and closer to home. Can Becca and Joe uncover the connection between the murders before the killer strikes the last name from his list?