In all the years she has watched the wolves in the woods behind her house, Grace has been particularly drawn to an unusual yellow-eyed wolf, unaware he turns into a human for a short time each year, but when the two find one another in human form, they vow to do whatever it takes to stay together.

Four children have discovered that they have spirit animals, a rare bond between human and animal that has launched them on a quest to save their world. The team heads to the forests of Eura, where another Great Beast is hidden.

Alix, the daughter of a Homanan princess and Cheysuli warrior struggles to accept her place in an ancient prophecy while Prince Carillon, Homana's rightful ruler, returns from exile to free his land from a evil tyrant.

When her father dies just before her birthday, seventeen-year-old Aderyn inherits the role of Protector of Atratys, a dominion in a kingdom where nobles are able to transform at will into the bird that represents their family bloodline. Aderyn's ancestral bird is a swan. But she has not transformed for years, not since witnessing the death of her mother - ripped apart by hawks that have supposedly been extinct since the long-ago War of the Raptors....