As a teenager, Hannah Jacobs was excited for a sleepover with her older sister Casey, but a blizzard altered their plans. Sometime that night, an unknown killer broke into Casey's apartment in Laramie, Wyoming, and brutally stabbed her multiple times, leaving her for dead.

Ten years later, Hannah is still haunted by the murder of her sister that fateful night, and with no viable suspects the case has long turned cold, nearly forgotten by everyone except her. Determined to uncover the truth, Hannah shutters her Private Investigation firm and travels to Laramie. With the help of a local amateur sleuth, Hannah discovers a series of murders linked to her sister, and evidence of a possible serial killer targeting young woman throughout the region.

As she delves deeper into the unsolved murders, Hannah's life is thrust into jeopardy, and she finds herself in a race to find the killer before she becomes his next victim.