In Switzerland in 1912, photographer Charles Castle (Toby Stephens) and Anna-Marie (Rachel Shelley), his fiancée, are married in an Alpine church.

He attends a lecture at the Theosophical Society, where Arthur Conan Doyle is examining a projected image of the Cottingley Fairies.

Conan Doyle seems convinced they are genuine, but Castle stands, publicly debunks the image, and hands out business cards to the audience.

However, he investigates the photograph, sees the shape laterally reflected in the girl's eye, and makes multiple large prints to discover how the picture was made.

After making a statement at the local police station, Castle encounters the Templeton girls, who are greeted by their father Nicholas, a Christian minister.

Castle discovers that Beatrice had been documenting her daughters' odd behavior, and in her notes finds that she had been experimenting with a distinctive rare flower.

[1] Time Out London said of Photographing Fairies "Aided by a fine cast (notably Kingsley as the girls' vicar father) and, appropriately, stunning photography by John de Borman, it's a fresh, rewarding film, intelligent and very beautiful.