A Song for Lya: And Other Stories

Two telepaths investigate the newly discovered world of Shkea, where every native inhabitant, and an increasing number of human colonists, worships a mysterious and deadly parasite. Winner of the 1975 Hugo Award for Best Novella.
Other short stories in this collection:
With morning comes mistfall
The second kind of loneliness
Override
Dark, dark were the tunnels
The hero
Fta
Run to starlight
The exit to San Breta
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