Gala opera evenings. Sudden wealth and fame. Dangerous undercover missions into the heart of Nazi Germany. Standing up to the perils of the Blitz. No one would have predicted such glamorous and daring lives for Ida and Louise Cook—two decidedly ordinary Englishwomen who came of age between the wars and seemed destined never to stray from their quiet London suburb and comfortable civil service jobs. But in 1923 a chance hearing of an aria from Madame Butterfly sparked a passion in the sisters that became a vehicle for both their greatest happiness and the rescue of dozens of Jews facing persecution and death.  Even when Ida began to earn thousands as a successful romance novelist, the sisters never departed from their homespun virtues of thrift, hard work, self-sacrifice and unwavering moral conviction. They sewed their own clothes, traveled third class, bought the cheapest tickets during opera season and directed every spare resource, as well as their own considerable courage and ingenuity, toward saving as many people as they could from Hitler's death camps. One of the most unusual and inspiring accounts to come out of the cataclysm of World War II.  Illustrated with black and white photographs.