Edward Eager was born in and grew up in Toledo, Ohio. A Harvard graduate, Eager was a lifelong fan of L. Frank Baum's Oz series, and started writing children's books when he couldn’t find stories he wanted to read to his own son. In his books, Eager often acknowledges his debt to E. Nesbit, whom he thought of as the best children's author of all time.

Knight’s Castle is the second book of the Tales of Magic series. Martha's children, Roger and Ann, and their Aunt Katharine's children, Eliza and Jack, find that the combination of a toy castle, Scott's Ivanhoe, and a little magic can build another wonderful series of adventures.