Claire Kennedy-McAdams was murdered on February 14, 2017. Her killer was never caught and still walks free. Three years later, Claire's younger sister, Luna, finds her diary. With new-found evidence, she hopes that she can solve her sister's murder once and for all. But as she reads, she realizes why her parents refuse to talk about Claire. The deeper she digs, the more she wishes that she could go back in time to when she knew nothing of Claire's death. Luna begins to panic as she realizes that her sister's murderer may be way closer to home than she ever could have thought.