 The first book (and first of the trilogy), "The Crystal Singer" (1982) is a fix-up of four stories published in 1974–1975.The Crystal Singer series revolves around the planet Ballybran.Under a permanent biohazard travel restriction due to a potentially-fatal symbiotic organism on the planet's surface, Ballybran is the source of valuable crystals that are vital to a number of industries, and home to one of the FSP's wealthiest (and most reclusive) organisations