As a teenager, Hannah Jacobs planned a sleepover with her sister Casey, but a blizzard altered the plans. Sometime that night, an unknown killer broke into Casey’s apartment 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 or evidence, the case has long turned cold, nearly forgotten about by everyone except her. Determined to un...