One of the original Witch World sextet, although not part of the "Tregarth Family" main sequence of early Witch World novels. This may be the strangest story in the entire long series, and one of the best. To pay an unearthly tribute, thirteen women must leave with the were-riders, thirteen torn from homeland to ride with illusion and darkness, to travel the unmapped lands with the nomads who were more than men and less than human. That was the price to be paid for an unholy alliance without which the homeland would have been lost. But was the price worth paying? Gillian, who became one of the Thirteen, was to find out - and in the finding, discover a lost land, a forgotten world, and a super-science challenge in a world of sorcery.