What was the title of C.S. Lewis’s 1933 novel about a pilgrim’s journey?

C.S. Lewis’s 1933 novel about a pilgrim’s journey is titled The Pilgrim’s Regress.

The full title is The Pilgrim’s Regress: An Allegorical Apology for Christianity, Reason and Romanticism. It was Lewis’s first prose work after his return to Christianity and uses an allegorical journey to explore intellectual and spiritual ideas. The title deliberately recalls John Bunyan’s The Pilgrim’s Progress.

The protagonist, John, travels through a landscape populated by figures and places representing philosophies, temptations, and approaches to religion. Lewis later acknowledged that the book’s symbolism could be difficult for readers who did not share his intellectual background. He added explanatory notes to clarify many references.

The novel is distinct from Lewis’s later science-fiction trilogy and from The Great Divorce, another allegorical work. It is important in understanding the development of Lewis’s Christian thought, but it was not his most commercially famous book.