A heart-stopping new novel, based on the extraordinary true stories of an American socialite and a British secret agent whose stunning acts of courage collide in the darkest hours of World War II, from the bestselling author of The Invisible Woman. Two women, two countries. Nothing in common but a call to resist. 1940. In a world newly burning with war, and in spite of her American family's wishes, Virginia decides to stay in occupied France with her French husband. She's sure that if they keep their heads down they'll make it through. But as the call to resist the enemy grows around her, Virginia must decide if she's willing to risk everything to help those in need. Nineteen-year-old Violette is a crack shot with an unquenchable spirit of adventure, and she's desperate to fight the Nazis however she can. When her mother sends her to find an exiled soldier, Violette meets the man who will change her life. Then tragedy strikes, and Britain's clandestine war organization--the Special Operations Executive--learns of Violette's dual citizenship and adept firearm handling and starts to recruit her. But Violette is no stranger to loss and must decide whether the cost of defiance is too great a price to pay. Set across the European theater of World War II, Sisters of Night and Fog tells the story of two women whose clandestine deeds come to a staggering halt when they are brought together at Ravensbrück concentration camp. A striking reminder of how deeply we are all connected, which forces us to ask, "Could I have done what they did?"