When a beautiful young Scottish woman learns the story of how the young man with whom she has been dancing came to have a swan's wing for a right arm, she determines to learn sorcery and to enlist the aid of his mercenary soldier, and free him from the spell.
(card catalog description)

This is a continuation of the fairy tale "The Brothers Who Were Turned into Birds" (Aarne-Thompson type 451. There are a number of versions of this; the link here is to a text from the Brothers' Grimm in which there are six brothers instead of seven. In other versions the brothers are turned into ravens. Courtesy of D. L. Ashliman.)

The background of this tale of adventure is sixteenth-century Scotland, in the Highlands of the clanfeuds and cattle-reiving days, and it has a sinister undertone of witchcraft and sorcery.