When Jo Harding falls down the stairs at home, she wakes up in the hospital with partial amnesia. In fact, she finds that she's lost an entire year of memories, and she can't remember anything that happened the night she fell. Her husband and her two children assure her that everything's fine, but Jo's family seems to have gone through a lot of dramatic changes in the past year, and she can't let go of the suspicion that there's more they're keeping from her. As she pieces together the details of the past 12 months, it becomes more and more clear that her family wants her to stay in the dark. But why?