Father Ramon Ruiz-Sanchez S.J., is a part of a four man scientific commission to the planet Lithia, there to study a harmonious society of aliens living on a planets which is a biologist's paradise. He soon finds himself troubled: how can these perfect beings, living in an apparent Eden, have no conception of sin or God? If such a sinless Eden has been created apart from God, then who is responsible? Winner of the Hugo Award for best novel, 1959.

A Case of Conscience 2016, Audible Studios on Brilliance

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A Case of Conscience 2014, Gollancz, London

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A Case of Conscience 2000, Del Rey Books, New York, NY

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A Case of Conscience 2000, Gollancz, London

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Case of Conscience 1987, Del Rey Books

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Case of Conscience 1979, Legend, London

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A Case of Conscience 1979, Del Rey Books

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A Case of Conscience 1975, Ballantine Books

ISBN-13: 9780345244802

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