One dark winter's morning, bride-to-be Cara Dunne is found hanging in her home, dressed in her wedding dress, with a lock of hair removed. Detective Lottie Parker is first on the scene. Looking at Cara's bruised and battered body, she wonders who could have hated her enough to kill her at the happiest time of her life. The case takes a darker turn that afternoon with another shocking discovery -- the broken body of a second young woman, pushed from the roof of the hospital where she worked. Fiona Heffernan was also due to be married, and her body is clad in a wedding dress, a lock of her hair cut off. The killings seem so personal that Lottie is convinced the girls have been killed by someone they knew. When she goes to break the news to Fiona's family, she's on the alert for anything suspicious. But then she makes a discovery that causes her blood to run cold -- Fiona's eight-year-old daughter Lily didn't return home from her dance recital that afternoon. Terrified that Lily will be the next victim of a twisted and dangerous individual, Lottie takes the case into her own hands, risking her life when she comes face-to-face with the killer.