What was the title of C.S. Lewis’s 1933 Christian allegorical novel about a pilgrimage?

C.S. Lewis’s 1933 Christian allegorical novel about a pilgrimage is The Pilgrim’s Regress.

The book follows a character named John as he travels through a symbolic landscape in search of the object represented by a distant island. Lewis presents the journey as an exploration of desire, belief, reason, and conversion. Its title deliberately echoes John Bunyan’s The Pilgrim’s Progress, but Lewis’s work reflects debates and intellectual pressures of the twentieth century.

The novel was Lewis’s first prose work after his return to Christianity. It is more overtly philosophical and difficult than his later children’s fiction. Lewis later acknowledged that some readers found its symbolism obscure, and he added a preface to clarify the ideas behind it. The Great Divorce, published in 1945, is another allegorical work but is not the pilgrimage novel from 1933.