Which 1955 memoir did C.S. Lewis write about his conversion and intellectual journey?

Surprised by Joy is the 1955 memoir C.S. Lewis wrote about his conversion and intellectual journey.

In Surprised by Joy, Lewis describes his childhood, education, reading, friendships, and changing views about religion. The title refers to an intense experience of longing or delight that Lewis associated with moments in literature, nature, and imagination. He presents this “joy” as an important clue in his spiritual development rather than merely as ordinary happiness.

The memoir ends before the later years of Lewis’s public Christian career. It is sometimes mistaken for A Grief Observed, which concerns the death of Joy Davidman and was published after her death. Surprised by Joy is instead primarily a retrospective account of how Lewis moved from atheism toward Christianity.