Iris Crane's tranquil life is shattered when a letter summons memories from her bittersweet past: her first love, her best friend, and the tragedy that changed everything. Iris, a young Australian nurse, travels to France during World War I to bring home her fifteen–year–old brother, who ran away to enlist. But in Paris she meets the charismatic Dr. Frances Ivens, who convinces Iris to help establish a field hospital in the old abbey at Royaumont, staffed entirely by women—a decision that will change her life. Seamlessly interwoven is the story of Grace, Iris's granddaughter in 1970s Australia. Together their narratives paint a portrait of the changing role of women in medicine and the powerful legacy of love.