In a small Irish village in 1862, a British nurse, Lib Wright, is sent to care for an eleven-year-old girl named Anna, who has apparently stopped eating for several months, inexplicably surviving only on water. The community is intrigued by this mystery, as many believe Anna is a divine miracle, while others suspect a hoax. Lib, with her scientific and skeptical background, confronts the duality between faith and reason.
As the days pass, Lib delves into a world of superstitions and religious fervor, where the beliefs of the people influence their perception of reality. The relationship between the nurse and the girl becomes the heart of the story, as Lib investigates the truth behind the phenomenon. Through her interactions with Anna and her family, she begins to uncover the pain and traumas that fuel this enigma.
The tension grows as Lib becomes obsessed with saving Anna from the harmful expectations of the community. Over time, the connection between the two women blossoms, revealing deep secrets and moral dilemmas. As the truth comes to light, Lib is forced to confront not only the faith of others but also her own demons and the struggle for life in a world where beliefs and science clash in unexpected ways.