The Chestnut Soldier (Magician Trilogy Series #3)

Gwyn can feel danger coming in the wind. Somehow he knows the warnings have to do with the broken toy horse that holds the evil spirit of a prince who lived long ago. When Gwyn discovers that the prince's dark soul has escaped from the horse and is seeking revenge Gwyn, Emlyn, and Nia have to figure our how to save the mysterious soldier who claims to be Nia's distant cousin. With the help of the Snow Spider, can they recapture the prince's soul without hurting the chestnut soldier?