When her beloved 8-year-old brother asks Margaret Devonshire (Megs) if Narnia is real, logical Megs tells him it's just a book for children, and certainly not true. Homebound due to his illness, and remaining fixated on his favorite books, George presses her to ask the author a question: "Where did Narnia come from?" Despite her fear about approaching the famous author, who is a professor at her school, Megs soon finds herself taking tea with C. S. Lewis and his own brother Warnie, begging them for answers. Rather than directly telling her where Narnia came from, Lewis encourages Megs to form her own conclusion as he slowly tells her the little-known stories from his own life that led to his inspiration. As she takes these stories home to George, the little boy travels father in his imagination than he ever could in real life. Lewis's answers will reveal to Megs and her family many truths that science and math cannot, and the gift she thought she was giving to her brother-the story behind Narnia-turns out to be his gift to her, instead: Hope.