Which C.S. Lewis autobiography recounts his conversion and spiritual development?

Surprised by Joy recounts C.S. Lewis’s conversion and spiritual development.

Published in 1955, the book is an autobiographical account of Lewis’s intellectual and religious journey. It describes his childhood imagination, literary influences, movement away from Christianity, and eventual return to belief. The title refers to the intense longing or “joy” that Lewis associated with moments of imaginative apprehension.

The work is not a conventional diary and does not narrate every year of his life equally. Lewis focuses on formative experiences and ideas, including his friendships with J.R.R. Tolkien and Charles Williams. Mere Christianity is a work of Christian apologetics rather than autobiography, while A Grief Observed reflects on bereavement after the death of his wife.