In 1880, Sir Michael Winter returns from Oxford University to take his rightful place as lord of Winterwood Manor. In his absence, the estate, has acquired a new groundskeeper, a brash young American named Thomas Gilchrist. When Michael sees that Thomas is educated and carries himself more like a lord than a servant, he suspects that Thomas may be hiding something. Before long, however, the two can no longer suppress their growing attraction and give into the passion brewing between them.
Just as Michael begins to believe he may at last have found happiness with Thomas, his household is thrown into turmoil. A guest of the estate is found in the woods after a garden party, mauled to death by some unknown creature. Soon it appears that a werewolf is stalking the nearby woods, and Michael begins to suspect that the man he loves might also be a beast and killer by moonlight.