In Picardy's fields

Summary: "Baroness Agnès de Saint-Aubin is a young Parisian doctor with a mysterious past. She follows the attractive-but married-Dr. Alan Bell to the front lines at the Château de Dragoncourt in Picardy, where they help battle the horrors of the trench war. When the castle is captured by German soldiers, the war turns personal as Agnès's secret becomes both a terrible liability--and a mighty weapon. Until Alan is severely injured and her world falls apart. Countess Madeleine, the young go-getter of the Dragoncourt family, is furious that she's been sidelined to a Swiss finishing school. Knowing her place is in the thick of the action, she runs away to join her siblings who are working as medics at the Château. Upon learning that it's fallen to the Germans, Madeleine is determined to effect a rescue of the French doctors and nurses held prisoner within. But what can a mere teenager do against the German army?"