What was the name of C.S. Lewis’s 1933 book about a fictional pilgrimage?

C.S. Lewis’s 1933 book about a fictional pilgrimage is The Pilgrim’s Regress.

The Pilgrim’s Regress: An Allegorical Apology for Christianity, Reason and Romanticism was Lewis’s first major prose work after his conversion to Christianity. Published in 1933, it follows a character named John on an allegorical journey through a landscape representing competing philosophies, beliefs, and intellectual temptations.

The title deliberately echoes John Bunyan’s The Pilgrim’s Progress, but Lewis’s work is not a sequel. Its subtitle signals the book’s purpose: Lewis was defending Christianity while also exploring reason and what he called “Romanticism,” his term for the intense longing that had shaped his imagination.

The book is less widely read than Mere Christianity or The Chronicles of Narnia, partly because its allegorical references can be demanding. Lewis later explained that he had not made every character or place correspond to only one real-world idea.