A rare book dealer finds himself at the heart of a string of paranormal events when he is hired to find the last two copies of a text, The Nine Gates of the Kingdom of Shadows, capable of summoning the Devil.
Lucie, who works as a white-hot fashion model, exhibits a dominant, often controlling, "Type A" personality, whereas identical twin Marie consistently projects a backward, reserved, laconic and unassuming attitude. When Lucie receives a covetable French recording contract, a significant problem stands in her way: the inability to sing. Marie possesses the voice of an angel, however, and quickly jets off to Paris to stand in for her sister, unannounced - little realizing the dangerous and even violent string of consequences that she is igniting.
Sydney Fox is a professor and globe-trotting "relic hunter" who looks for ancient artifacts to return to museums and/or the descendants of the original owner. She is aided by her linguistic assistant Nigel and occasionally by her somewhat air-headed secretary Claudia. She often ends up battling rival hunters seeking out artifacts for the money.
