This sympathetic novel about the effect of a sex change on a romantic relationship, a family, and a community could almost be sold as a textbook--a kind of transgender Guide to the Perplexed. With its calming tone and scrupulous sensitivity to the feelings of all involved, it sometimes reads like a textbook, too. But while nobody is likely to launch a protest campaign over the cautious revelations of Trans-sister Radio, that's precisely the subject of Chris Bohjalian's seventh novel, in which a male college professor in a small Vermont town transforms himself into a woman. Even Dana Stevens's initial step in this direction--donning women's clothing--elicits a powerful reaction from the community. And what about Dana's new girlfriend Allie Banks, a beloved local schoolteacher who fell in love with him before learning of his plan? Her initial instinct is to end the relationship. Then she decides to stand by Dana, inspired rather than daunted by her stuffy ex-husband Will's opposition to the "effeminate" guy she's dating, and by the horrified reactions of the parents at her school. She does, it's true, continue to love Dana after the sex reassignment surgery. And she stoically endures the threatening notes in her school mailbox and the crude graffiti on her front door, as well as the minor vindication of a local public radio story on their battle. Yet Allie never makes the emotional shift from heterosexual woman to lesbian. Breaking off the affair, she s