"The Sheltering Sky" is a novel about an American couple, Port and Kit Moresby, who travel to the North African desert accompanied by their friend Tunner. The journey, initially an attempt to cure their marital woes, quickly descends into a harrowing journey of self-discovery and exploration of the human condition. As they move further into the desert, the harsh environment and their isolation from the outside world push them to their psychological limits, leading to devastating consequences.

Set in Chicago during World War II, the novel follows the life of a young man waiting to be drafted into the army. As he waits, he grapples with his feelings of isolation, frustration, and anxiety, which are exacerbated by his joblessness and the uncertainty of his future. His diary entries reveal his philosophical reflections on life, his struggles in his relationships, and his increasing mental instability as he feels more and more trapped by his circumstances.