A curse, a sin, and a dark bargain with the Sidhe had condemned Caith mac Sliabhan to wander the wild woods, outcast from all humankind. Only Dubhain - a pooka, a Sidhe sprite - was his companion. Caith now was bound to do the will of the Sidhe, always fearing that his own taint would somehow make him cause pain and sorrow to others..But even an outcast like Caith could not resist taking refuge in a forest cabin, where two mysterious golden youths, a boy and girl, dwelled. 'Husband and wife, we are', said the boy, but Caith could have sworn they were twins..The mysterious couple were under a spell themselves - and despite his curse, Caith felt compelled to aid them. Caith soon fell into a dark adventure that led him and the Sidhe into the evil hands of the notorious witch of Dun Glas.