Winner of the National Book Award : a novel of fame, honor, and really bad weather / Jincy Willett.

Enhanced descriptions from Syndetics:

"Winner of the National Book Award, " the long-awaited novel from the author of the acclaimed collection, "Jenny and the Jaws of Life, " is an unusual and wonderful novel that is somehow able to be at once bleak and hilarious, light-hearted and profound.
It's the story of two sisters. Abigail Mather is a woman of enormous appetites, sexual and otherwise. Her fraternal twin Dorcas couldn't be more different: she gave up on sex without once trying it, and she lives a controlled, dignified life of the mind. Though Abigail exasperates Dorcas, the two love each other; in fact, they complete each other. They are an odd pair, set down in an odd Rhode Island town, where everyone has a story to tell, and writers, both published and unpublished, carom off each other like billiard balls.
What is it that makes the two women targets for the new man in town, the charming schlockmeister Conrad Lowe, tall, whippet-thin and predatory? In Abigail and Dorcas he sees a new and tantalizing challenge. Not the mere conquest of Abigail, with her easy reputation, but a longer and more sinister game. A game that will lead to betrayal, shame and, ultimately, murder.
In her darkly comic and unsettling first novel, Jincy Willett proves that she is a true find: that rare writer who can explore the shadowy side of human nature with the lightest of touches.