Three years ago, Christine Ireland's beautiful and vivacious sister disappeared. Dara left a note saying she had run away, but when a body is discovered in the small town of Winston, West Virginia, Christine suspects it might be Dara.

But if the body does belong to Dara, then who is it who's been sending her father letters, each one with a different postmark and signed with the letter D?

Then Christine finds her sister's diary. It quickly becomes clear that, in the weeks leading up to her disappearance, Dara believed she was being stalked. Christine soon feels like she, too, is being watched. Will she share her sister's fate, or did Dara really manage to escape?