The story follows the facts behind the real events—how the news attracted the attention of Sir Arthur Conan Doyle, how nationally renowned the girls became, and the hope of people who believed in the fantasy during war times.

After her grandfather passes away, Olivia inherits his bookshop in Ireland called Something Old, so she decides to leave behind her life in London temporarily, which is tied to a fiancée and a steady job as a bookbinder.

After finding a manuscript with Frances’s story and photographs of fairies, Olivia begins to struggle with choosing between a settled life in London or a new adventure where she feels a connection and meaning behind her newfound work.

Having lost her own mother as a child and trying to take care of her grandmother, who suffers with Alzheimer’s, Olivia believes that holding on to this story is the only way to reconnect with her family.

When Olivia finally travels to Cottingley, she discovers that the girl in her dreams that Frances also talked about in her memoir was her grandmother's sister, who died when she was a kid from a fall in the garden.

According to Kirkus Reviews, "The insight into the true story of the Cottingley fairies is interesting, and it's easy to understand why two girls might play along with an innocent trick that became a worldwide sensation."

However, regarding the present events unfolding throughout the story, they write, "Olivia's struggles are never quite as compelling, and readers may find themselves eager to slip back into the world of the fairies.