Catalina de Erauso, known as the Lieutenant Nun, is one of the most colourful figures in the conquest of the Americas. A novice in a nunnery, she escaped and dressed as a boy. She then embarked on a chequered career in Peru as soldier, gambler, brawler and duellist. When discovered, the king rewarded the cross-dresser with a military pension, and the Pope with permission to wear male clothes. Heidi Zogbaum follows the path of this exceptional woman and the historical circumstances which allowed such capers.