"By age twenty, at the height of the Jazz Age, Trudy Ederle was the most accomplished swimmer in the world. She'd won Olympic gold and set a host of world records. but the greatest challenge remained: the English Channel. Only a few swimmers, none of them women, had ever made the treacherous twenty-one mile crossing. Trudy's failed first attempt seemed to confirm what many naysayers believed: no woman could possibly accomplish such a thing. In 1926,...