What was C.S. Lewis’s 1955 autobiography about his spiritual development called?

C.S. Lewis’s 1955 autobiography about his spiritual development was called Surprised by Joy.

Surprised by Joy traces Lewis’s intellectual and religious journey from childhood through his return to Christianity. The title refers to experiences of intense longing or desire that Lewis called “Joy,” rather than to ordinary happiness. He presents this feeling as a recurring clue that shaped his imagination and eventually his understanding of faith.

The book covers his early love of mythology, his education, his experience in the First World War, and the influence of friends including Owen Barfield and J.R.R. Tolkien. Lewis describes moving from atheism to theism and then to Christianity during the early 1930s.

The work is an intellectual memoir, not a complete day-by-day autobiography. Lewis omits or compresses some personal material, and his later marriage to Joy Davidman is not part of the story because it occurred after the period mainly covered.