Soon we'll know the truth about Santa Claus, the Tooth Fairy and the Easter Bunny. At least, the early years.

Award-winning author and filmmaker William Joyce is working on a new series of picture books and chapter books. In "The Guardians of Childhood," readers learn the "formative stories of childhood legends," Simon & Schuster Children's Publishing announced Monday.

The first two books come out in the fall.

Joyce has created characters for "Toy Story" and other films and also is known for such books as "George Shrinks" and "Santa Calls." He is co-directing "Rise of the Guardians," based on his new series and scheduled to be released by DreamWorks Animation in 2012.