The New York Times bestselling author turns the clock back to a time when two young girls convinced the world that fairies really did exist...

1917: When two young cousins, Frances Griffiths and Elsie Wright from Cottingley, England, announce they have photographed fairies at the bottom of the garden, their parents are astonished. But when the great novelist, Sir Arthur Conan Doyle, endorses the photographs' authenticity, the girls become a sensation; their discovery offering something to believe in amid a world ravaged by war.

One hundred years later... When Olivia Kavanagh finds an old manuscript and a photograph in her late grandfather's bookshop she becomes fascinated by the story of the two young girls who mystified the world. As Olivia is drawn into events a century ago, she becomes aware of the past and the present intertwining, blurring her understanding of what is real and what is imagined. As she begins to understand why a nation once believed in fairies, will Olivia find a way to believe in herself?