If you were drawn to Father Ruiz-Sanchez's struggle to reconcile Catholic doctrine with the alien Lithians in A Case of Conscience, you'll be captivated by The Sparrow. Here, Jesuit priest Emilio Sandoz leads a mission to a newly discovered alien world, only to face profound spiritual and ethical dilemmas that challenge his faith and humanity in deeply personal ways.

If you appreciated the philosophical debates and existential questioning sparked by human-Lithian interaction in A Case of Conscience, you'll find Contact equally compelling. Dr. Ellie Arroway's encounter with extraterrestrial intelligence forces her—and humanity—to grapple with questions of science, belief, and what it means to be human.

If the psychological tension and moral ambiguity of Father Ruiz-Sanchez's choices in A Case of Conscience resonated with you, Solaris is a must-read. The story immerses you in the minds of scientists orbiting the enigmatic planet Solaris, where their own inner struggles and desires are reflected back by the unknowable alien intelligence.

If you enjoyed exploring the rich and distinct Lithian culture in A Case of Conscience, you'll appreciate the detailed worldbuilding in Foreign Devils, where human characters must navigate the customs, values, and unexpected moral challenges of an alien civilization that operates by entirely different rules.

If you liked how A Case of Conscience uses science fiction to interrogate society and morality through the lens of an outsider, The Dispossessed will engage you with its depiction of Shevek, a physicist who moves between two radically different worlds and philosophies, each with its own values and contradictions.