Nineteen-year-old Kate Flanagan has already endured entirely too much in her young life. Two years earlier, her kid sister, Angie, and her best friend, Sandra, were kidnapped from a San Diego amusement park, and Kate's guilt over the part she played in the tragedy is beyond measure. Believing herself undeserving of a normal life, Kate avoids relationships, feels estranged from her parents, and has no social life. When she begins receiving increasingly chilling anonymous notes on her windshield, she dismisses them as the work of a random stalker. The fifth note, however, claims that the writer has information about her sister. Hopeful that Angie and Sandra are still alive, distrustful of the police, and frightened by the escalating threat of the notes, Kate nevertheless decides to smoke out the source of the notes. With the help of an amateur private investigator, Kate sets out on a mission to find her sister and best friend--a hunt that leads her straight to her deranged stalker. In this intriguing mystery tale, a woman desperate to atone for the past mistakes that have cost her nearly everything puts her life on the line in a desperate attempt to right a terrible wrong and catch a determined criminal.