Though Mary Muir had once dreamed of becoming William MacEachern's bride, after thier unexpected reunion she found his abrupt proposal of marriage surprising. And when her long-lost love instead insisted on a hasty wedding, she felt slightly apprehensive. But once inside his fairy-tale Scottish castle, Mary saw her dreams of wedded bliss turn nightmarish, as her attentive fiance was transformed into an unbridled stranger. Was William possessed by the spirit of a savage ancestor - or were there other, more worldly demons the cause of his bizarre behavior? With the help of a solitary assistant - Familiar, the feline detective - would Mary discover the truth in time to save her beloved?