Lithia -- an alien world and a biologist's paradise. A four man team of scientists were investigating, among them Ruiz-Sanchez. They were happy there at first -- all of them. But Ruiz-Sanchez: scientist was also Father Ruiz-Sanchez: Jesuit priest, and he was growing afraid. Afraid because he had realised that the extraordinary planet was more than a biologist's paradise. It was a Paradise in all other respects as well. He knew that this could only be a trap, but if he acknowledged that it was a trap, then he became a heretic, cast out and damned for eternity.