Lyn's Talent

Lyn Harlan, young schoolteacher, finds herself stranded on her half-brother's world, with a sense of loss, a feeling of something very important she must do, and without her memory.
She must recapture her memory, perform the quest, and return to Earth; and has no idea where to start.
Adam, her half-brother, has been waiting for her. Their father has told him that when she arrives, it will be time for Adam and Lyn to start the new race to replace the dying Watchers.
She adamantly refuses to have anything to do with it.
Quinbar, of the galactic ruling Centar, has his own plans for Lyn, which she must thwart.