Which 1933 C.S. Lewis book tells of a traveler named John who visits the house of Mr. Savage?

The 1933 C.S. Lewis book about a traveler named John visiting the house of Mr. Savage is The Pilgrim’s Regress. Its full title is The Pilgrim’s Regress: An Allegorical Apology for Christianity, Reason and Romanticism.

Lewis modeled the work partly on John Bunyan’s The Pilgrim’s Progress, but his allegory is set in a modern intellectual landscape. John begins with an imposed burden and travels through encounters representing ideas, philosophies, cultural attitudes, and religious positions. Mr. Savage is one of the figures he meets during the journey.

The book was Lewis’s first published prose work after his conversion to Christianity. Readers sometimes confuse it with The Great Divorce, another allegorical work, but that later book presents a journey from a gray town toward heaven. The Pilgrim’s Regress is more directly structured as a Bunyan-inspired journey.