American Josie Anderson and Parisian Arlette LaRue are thrilled to be working in the French resistance, stealing so many Nazi secrets that they become known as the Golden Doves. When they are finally arrested and taken to the Ravensbrück concentration camp, along with their loved ones, a reclusive Nazi doctor does unspeakable things to Josie’s mother. And Arlette’s son is stolen from her, never to be seen again. A decade later, the Doves fall headlong into a dangerous dual mission: Josie is working for U.S. Army Intelligence and accepts an assignment to hunt down the infamous doctor, while a mysterious man tells Arlette he may have found her son. The Golden Doves discover a web of terrible secrets and must put themselves in grave danger to finally secure justice and protect the ones they love.

The 2016 bestseller LILAC GIRLS introduced readers to Caroline Ferriday. Now, in SUNFLOWER SISTERS, Martha Hall Kelly tells the story of Ferriday’s ancestor Georgeanna Woolsey, a Union nurse during the Civil War whose calling leads her to cross paths with Jemma, a young enslaved girl who is sold off and conscripted into the army, and Anne-May Wilson, a Southern plantation mistress whose husband enlists. Inspired by true accounts, the novel provides a vivid, detailed look at the Civil War experience --- from the barbaric and inhumane plantations, to a war-torn New York City, to the horrors of the battlefield. It’s a sweeping story of women caught in a country on the brink of collapse, in a society grappling with nationalism and unthinkable racial cruelty.

It is 1914, and Eliza Ferriday is thrilled to be traveling to St. Petersburg with Sofya Streshnayva, a cousin of the Romanovs. The two met years ago one summer in Paris and became close confidantes. But when Austria declares war on Serbia and Russia's imperial dynasty begins to fall, Eliza escapes back to America, while Sofya and her family flee to their country estate. In need of domestic help, they hire the local fortuneteller's daughter, Varinka, unknowingly bringing intense danger into their household. On the other side of the Atlantic, Eliza is doing her part to help the White Russian families find safety as they escape the revolution. But when Sofya's letters suddenly stop coming, she fears the worst for her best friend.

New York socialite Caroline Ferriday's world is forever changed when Hitler’s army invades Poland in September 1939 --- and then sets its sights on France. Kasia Kuzmerick, a Polish teenager, is drawn deeper into her role as courier for the underground resistance movement. For the ambitious young German doctor, Herta Oberheuser, an ad for a government medical position seems her ticket out of a desolate life. Once hired, though, she finds herself trapped in a male-dominated realm of Nazi secrets and power. The lives of these three women are set on a collision course when the unthinkable happens and Kasia is sent to Ravensbrück, the notorious Nazi concentration camp for women.