From the winner of the Hugo and SFWA Grand Master Awards
The Riddle of Enigma
Years of exacting study were coming to an end. All five student scientists, each the best its species had to offer, were one step away from their final degrees. One examination remained: the students were to determine why the tiny planet of Enigma, a planet with so little mass that it should never have had an atmosphere, in fact it did.
Everything seemed to be running smoothly until the only Human member of the team, Molly was accidentally blown into one of the deep fissures that pocked the planet's surface.
She found herself trapped in a series of tunnels and caves that only led her deeper into the riddle that was at the heart of Enigma. But as her concerned companions followed her, they found Enigma's most puzzling anomaly. For in the dark passages they discovered life - life which couldn't possibly exist.
Hal Clement (1922 - 2003)
Hal Clement is the nom de plume under which Harry Clement Stubbs wrote science fiction. Born in Massachusetts in 1922, he graduated from Harvard with a BSc. in astronomy, and later added degrees in chemistry and education. A former B-24 pilot who saw active service during the Second World War, he worked for most of his life as a high-school science teacher. He made his reputation as an SF writer with the work that appeared in Astounding, where his best-known novel, Mission of Gravity, first appeared in serialised form in 1953.