What happened to Sadie? This question has plagued 25-year-old Rebecca Danser for 19 years. Imagine if at the age of six, you had ditched your four-year-old sister to go play with your friend... and then you never saw her again. In the intervening years, now living in Silicon Valley, Rebecca has made a mess of her life. She hates her job, has no career prospects, and has never had a successful relationship unless you count sex with a relative stranger during her time jumps into the past. But soon she realizes this strange ability she recently gained, allowing her to cast her consciousness back into a younger version of herself, can be used to discover who took Sadie that fateful day. She must travel back in time to witness the event with her 6-year-old eyes. What she learns leads her into a remote forest in the Sierra Mountains... where the monster responsible for the destruction of her family lies in wait for her.