Sensitized to the next world by her own near-death by drowning, Sarah is the frightened recipient of pleas and warnings from an unhappy presence in her family's new upscale, bargain-priced home in Houston. No one--including his real-estate agent, who lives next door--has told Dad about the grisly murder of two years ago, when the previous owners'teen-age son, Adam, inexplicably killed Darlene, a girl who came to make a delivery. Though he confessed, Adam is free on a technicality peculiar to Texas law. But the warnings Sarah receives are in Spanish, apparently from Rosa, an illegal alien employed in the house years before; no one seems to be willing to say what has become of her. As Sarah comes closer to the truth, Nixon keeps the reader one step ahead of her with the tried-and-true device of a killer that the heroine recognizes only when it may be too late. The skillful telling here, with such carefully developed details as Sarah's reluctance to confide in parents or friends since her earlier description of an out-of-body experience was met with incredulity, should hold readers fast until the satisfying conclusion.