What was the name of C.S. Lewis's memoir about his early life and conversion?

Surprised by Joy is C.S. Lewis's memoir about his early life, intellectual development, and conversion to Christianity. It was published in 1955.

The book traces Lewis's childhood, education, experiences during World War I, and movement from atheism toward Christian belief. Its title refers to “joy,” Lewis's term for a powerful longing or fleeting experience that he associated with imaginative and spiritual desire.

Surprised by Joy is not a complete autobiography. It concentrates on the development of Lewis's thought and religious outlook rather than offering a year-by-year account of every part of his life.

A Grief Observed is another autobiographical work, but it focuses on Lewis's grief after the death of his wife, Joy Davidman. The Pilgrim's Regress is an allegorical novel, not his memoir of conversion.