The Golden Swan (The Book of Isle #5)

Young Dair, changeling son to King Trevyn of Isle, is called by a mysterious vision to share his destiny with a strange wandering youth known as Frain. But when the gentle, wolf-human Dair finds his bond brother, the curse of a dark enchantment and the search for a lost love has claimed Frain's injured heart. Now Dair must journey with him, for only together would they unveil the prophecy and know the peace hidden with their web of fate.