In Sunday's Parade magazine, the mentioned two books that look interesting. Citizens of London - The Americans Who Stood with Britain in Its Darkest, Finest Hour by Lynne Olson and Americans in Paris: Life & Death Under Nazi Occupation by Charles Glass. Both books are stories about Americans helping to defeat Germany in WWII.
About Citizens of London from Lynne Olson's website:
In her latest book, Lynne Olson, author of the highly acclaimed Troublesome Young Men, focuses once again on Britain in World War II, this time from an American perspective. Citizens of London is the engrossing behind-the-scenes story of how the United States and Britain forged their crucial wartime alliance, as seen from the viewpoint of three key American players in London. Drawing from a wide variety of primary sources, Olson depicts the personal journeys of these men, who, determined to save Britain from Hitler, helped convince a cautious Franklin Roosevelt and reluctant American public to back the British at a critical time.
The three—Edward R. Murrow, the handsome, chain-smoking head of CBS News in Europe; Averell Harriman, the hard-driving millionaire who ran FDR’s Lend-Lease program in London; and John Gilbert Winant, the shy, idealistic U.S. ambassador to Britain—formed close ties with Winston Churchill and were drawn into Churchill’s official and family circles. So intense were their relationships with the Churchills that all of them were involved romantically with members of the prime minister’s family: Harriman and Murrow with Churchill’s daughter-in-law, Pamela, and Winant with his favorite daughter, Sarah.
About Americans in Paris from Charles Glass' website:
Americans in Paris tells for the first time the true story of the thousands of Americans who stayed in Paris during the Nazi occupation. This tale of adventure, intrigue, passion and deceit exposes the lives of Americans caught up in war from the day the German army marched into Paris in June 1944 and took many of them into the Paris underground, the Maquis and the concentration camps.