The sorcerer — Eric Ericson

When Mason, a young scientist, escorts his lover to a wild sexual orgy he suddenly finds himself unwittingly initiated into a ruthless and dedicated coven - a coven with unparallelled Satanic powers spurred on to ever greater heights of depravity by its power-crazed 'master'. In return for his services Mason is promised untold delights, but should he fail he is assured of a ghastly and horrible vengeance. His task - to unravel the secrets of the Jewel, the most sought-after goal of the black arts, the elixir of eternal life. But as he becomes acquainted with the perverted ways of the coven he develops peculiar powers - powers which the coven hadn't bargained on. Powers which are growing all the time.
As the bid for the Jewel becomes bloodier and more violent he bides his time. Sooner or later he knows his moment will come...