The Supergirls, Mike Madrid’s book about the evolution of female comic-book characters, is sharp and lively — and just obsessive enough about women who wear capes and boots to be cool but not creepy. The guy clearly loves this stuff. And he’s enough of a historian to be able to trace the ways in which the portrayal of sirens and supergirls has echoed society’s ever-changing feelings about women and sex. The book has some illustrations, but no comic-book art. That’s a bit of a drag, but presumably a function of how much the rights to the artwork would have cost. In any case, all the lovely crime fighters that Madrid champions are as close as a comic-book store. A?