The ultimate cure that could heal any disease? Crazy. That's exactly what research scientist Marian Creighton has always believed about her father's quest, even if it does stem from a desire to save her sister Ellen from the genetic disease that stole their mother from them. But when her father falls into a coma after drinking a vial of holy water believed to contain traces of residue from the Tree of Life, Marian must question all of her assumptions. He's left behind tantalizing clues that suggest he's crossed back in time. Insane. Until Marian tests his theories and finds herself in the Middle Ages during a dangerous peasant uprising. William Durham, a valiant knight comes to Marian's rescue and offers her protection . . . as his wife. The longer Marian stays in the past, the more she cares about William. Can she ever find her father and make it back to the present to heal her sister? And when the time comes to leave, will she want to?