Twelve-year-old Kate's idyllic life in Baton Rouge takes a drastic turn when a mysterious shoulder pain reveals she has Fibrodysplasia Ossificans Progressiva, a rare genetic disorders, challenging her to adapt with support from loved ones and a pen pal, Amie, who shares her experience with FOP.

"Constance Haverhill is without prospects. Her mother has just passed away, her brother is newly married, and now that the Great War is over, she has been asked to give up managing the estate she helped to run when the men all joined the army. It is suggested to her that she become a governess. But first, she will act as caretaker to Mrs. Fog, an old family friend who is convalescing at a seaside resort. Constance is soon swept up in the social whirl...