It has become a ritual as predictable as the turning of the seasons: A married politician is caught, sometimes literally, with his pants down, and all eyes turn to his long-suffering wife, she of the dark sunglasses and tight-lipped jaw. More often than not, she stands beside him, holding his hand while the news cameras click away. Is her hand secretly digging its nails into his palm? It's impossible to say. After all, loyalty can be a maddening and mysterious thing. Here are three books that grapple with the complexities of standing by your man.