"A Canticle for Leibowitz" is a post-apocalyptic science fiction novel that explores the cyclical nature of history through the lens of a Catholic monastery in the American Southwest. After a devastating nuclear war, the monks of the Albertian Order of Leibowitz work to preserve the remnants of mankind's scientific knowledge until the world is again ready for it. Over the course of centuries, civilization rises and falls, wars are fought, and scientific advancements are rediscovered and then lost again. The novel is a poignant commentary on the potential for humanity to repeat its mistakes.

"The Mind Invaders" is a thrilling novel that explores the intersection of science, faith, and the supernatural. The book follows a journalist who stumbles upon a secretive group developing a technology to control minds. As he delves deeper, he discovers that the group's intentions are far from benign and are linked to a prophetic plan for world domination. The protagonist must use his faith to combat this evil and prevent global catastrophe.

In this science fiction novel, a Jesuit priest and biologist, part of a four-man scientific commission, grapples with a moral dilemma after studying the inhabitants of the planet Lithia. The Lithians are an advanced, peaceful reptilian species living in an apparent utopia without any concept of religion or God. The priest's crisis deepens as he questions whether the Lithians' society is inherently evil, a creation of Satan designed to challenge faith, or if it can coexist with human and Christian values. His quandary is compounded when he is given a Lithian egg to take back to Earth, which hatches into a creature that could influence the future of humanity and challenge the very foundations of his beliefs.