YA Crystal singer Killashandra Ree is desperate to get off the crystal-mining planet of Ballybran, so she takes what at first sounds like a routine assignment replacing a shattered crystal in the main Sensory Organ on planet Optheria. While she is there she is also to find out why Optherians never leave the planet. She is kidnapped and marooned on an isolated island, but escapes, only to encounter her handsome kidnapper Lars Dahl, with whom she eventually falls in love. From Lars she discovers that the Optherian Sensory Organ is not only a musical instrument, but that it also uses subliminal suggestion to keep Optherians from wanting to leave their planet or oppose the planet's rulers. Together they plan sabotage. In this sequel to Crystal Singer (Ballantine, 1982), McCaffrey returns to the more romantic vein of her dragon novels. Killashandra is bratty, feisty and independent. Lars is big and lovable, sometimes shrewd, sometimes simple. They make an unlikely and not always convincing pair. Otherwise, the book is a satisfying adventure for those who like their science fiction spiced with humor. Betsy Shorb, PGCMLS, Md.