Molly, a seventeen-year-old girl who suffers from dissociative identity disorder, has played host to Mabel, a completely distinct personality, for most her life. When Molly faces a crisis Mabel doesn't know she can handle, Mabel lets Molly in on her secrets. Molly feels like she's missed bits and pieces of her life. Now, she's figuring out why. Now, she's remembering her own secrets. And in doing so, Molly uncovers the separate life she seems to have led ... and the love that she can't let go.