France, 1944: The Nazis still occupy Paris, and twenty-five-year-old Gabby Foucher hates these enemies, though, as the concierge of ten rue Royale, she makes it a point to avoid trouble, unlike her sister Yvette. Until she, like her sister, is recruited into the Resistance by Catherine Dior—sister of the fashion designer, Christian Dior. Gabby and Yvette are both swept into the world of spies, fugitives, and Resistance workers, and it doesn't take long for the sisters to realize that their lives are in danger. Gabby discovers an elderly tenant is hiding a wounded British fugitive, and Yvette becomes a messenger for the Resistance. But as Gabby begins to fall in love with her patient and Yvette’s impulsiveness lead her into intrigue at an ever-higher level, both women will discover that their hearts and even their souls hang in the balance as well.