The Healing Spring: The Inner Seas Kingdoms Series

Kestrel is a resident and guard in the Elven nation of the Eastern Forest, but his obvious human heritage makes him the victim of discrimination by those of pure Elven ancestry. And when the elves face war with the humans of the neighboring nations, Kestrel is distrusted and removed from combat duty. But the gods of both races see a roll for Kestrel to play in a greater, and more sinister battle that will consume humans and elves alike, and they shower him with favors that press him into a new service as an elven spy. Only his superiors never expected Kestrel to find the life of the humans to be so appealing...