Huckleberry Finn dressing as a girl is a famously comic scene in Mark Twain's novel but hardly out of character--for the author, that is. Twain "troubled gender" in much of his otherwise traditional fiction, depicting children whose sexual identities are switched at birth, tomboys, same-sex married couples, and even a male French painter who impersonates his own fictive sister and becomes engaged to another man. This book explores Mark...