For most of her life, Doctor Sadie Thorsen has imagined seeing the world on grand adventures. When America joins the war raging across the Atlantic in 1917, it seems her dreams are about to come true. She travels overseas as a contracted physician, eager to do her part to help the war effort. Endless streams of wounded push her to the limits of endurance, then she receives word Harley John Hobbs, the man she's loved for years, is missing in action. Unable to bear the thought of life without him in it, she refuses to let go of her hope that he’s alive.