The Scottish poet, author, and Christian minister George MacDonald is widely known as an inspiration for the works of C. S. Lewis, J. R. R. Tolkien, and Lewis Carroll, among others. Nineteenth century photographs of MacDonald present a forbidding visage, embodying Victorian-era solemnity. Yet behind the facade, as Daniel Gabelman writes, lived a whimsical and fantastical muse. Indeed, MacDonald imbued theological weight through childlike lightheartedness. Gabelman ably reveals in MacDonald's writings a bridge between playfulness and seriousness in the modern imagination. George MacDonald...