Professor James Lowry didn't believe in spirits, or witches, or demons. Not until a gentle spring evening when his hat disappeared, and suddenly he couldn't remember the last four hours of his life. Now, the quiet university town of Atworthy is changing - slightly at first, then faster and more frighteningly each time he tries to remember. Lowry is pursued by a dark, secret evil that is truning his whole world against him while it whispers a warning...