A Case of Conscience

"Father Ruiz-Sanchez- Jesuit member of a four-man scientific team investigating a new alien world- was very happy on Lithia, a biologist's paradise. He grew afraid only when it became clear that this extraordinary planet was a paradise in all other respects as well. And this Ruiz knew could only be a trap, on a scale such as had never been set for the human race before. But if he acknowledged that it was a trap- then Ruiz was himself a heretic, cast out and damned for eternity!"--Back cover.