As the travellers gather in the Tabard Inn at the start of a pilgrimage to Canterbury, they agree to amuse themselves on each day of their journey with one tale and each evening with another - but the latter to be of mystery, terror and murder. And so begins the Knight's tale. It opens with the destruction of a sinister cult at its stronghold in the wilds of Oxfordshire during the reign of William the Conqueror, and then moves to Oxford some two hundred years later where terrible murders are being committed. The authorities seem powerless but the Abbess of the Convent of St Anne's, believes the murders are connected with the legends of the cult and she petitions the King for help. As the murders continue unabated, special commissioner Sir Godfrey Evesden uncovers clues that lead to a macabre world sect, which worships the dark lord. But he can find no solution to a series of increasingly baffling questions and matters soon worsen...