Twenty-year-old Abigail Turner has only known her mother, Claire - who died shortly after she was born - through letters, videos, postcards and journals. Abby’s father, Josh, has raised his precious daughter himself, but his overprotectiveness has become stifling. Abby longs to forge out on her own and see the world after a childhood trapped indoors: she suffers from bronchopulmonary dysplasia, which means a case of the sniffles can rapidly escalate into life-threatening pneumonia.

But when Abby’s doctor declares her healthy - for now - her grandmother Millie whisks her away to Europe to visit the Christmas markets that her mother cherished and chronicled in her travel journals. Despite her father’s objections, Abby and Millie embark on a journey of discovery in which Abby will learn secrets that force her to reevaluate her image of her mother and come to a more mature understanding of a parent-child bond that transcends death.