Shannon Clayton is 35 year old woman with a troubled past. When she tries to kill herself on her wedding day, her fiancé commits her to a mental hospital. Her psychiatrist is the best in her field, but Shannon will not speak to her. She will only communicate through letters. The doctor needs a new perspective on Shannon's tormented soul, so she calls on Kathryn. Kathryn is Shannon's twin sister who wants nothing to do with her. But she can't turn her back on her sister because she is drawn to the letters Shannon has written for some inexplicable reason. She is drawn to her sister's misery no matter how hard she fights it. Why can't she turn away? What is it about Shannon that makes it impossible for Kathryn to ignore? It's a secret they share, that only the letters will reveal.