[In Duncan's Stranger with My Face, protagonist Laurie Stratton] eventually discovered that she was an adopted child, one of a pair of identical twins of an American Indian mother and a white father; she was both fascinated and repelled by her twin, Lia, who became more and more visible and began to exert great influence. But Lia was an envious, malevolent person with a secret aim to inhabit Laurie's body. After several near-tragedies, Lia did take over her twin, and only the quick-witted action of Laurie's sister Megan saved Laurie from roaming forever as a disembodied spirit. The ghostly Lia is deliciously evil; the idea of astral projection—Lia's method of travel—is novel; the island setting is vivid; and the relationships among the young people are realistic in the smoothly written supernatural tale.