Taiwan Butterfly: A Modern Gothic Tale of Eternal Love and Sorcery for Teens and Young Adults by Amadeus Rockefeller

In 1949 a missionary takes possession of a powerful Tibetan grimoire and flees to Taiwan. There he begins teaching the art of sorcery to a teenage girl, who enthusiastically takes to the dark arts. But when she is killed in a freak accident, her boyfriend approaches the sorcerer, hoping to learn the power he wields to bring her back to life.