A Case of Conscience By James Blish

Mass Market Paperback in good, not great, condition, this copy has wear to the spine and cover edges, scuffing to the covers. It is well bound with an unmarked interior. "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?"