Discovering the Moon follows the story of a soon-to-be fifteen-year-old girl named Fern who lives on the remote Orkney Islands in northern Scotland. Fern explores what it means to reach her fifteenth birthday as well as what it means to be in charge of her own spiritual destiny by having deep spiritual conversations with her loving family members. These conversations focus on discussing the Long Obligatory Prayer, a prayer that every Bahá'í over the age of fifteen is required to recite, and through study she ultimately discovers her own sense of purpose. In the Bahá'í Faith, the age of fifteen marks the end of childhood and the beginning of an individual's sole responsibility for the progression of their spiritual existence. Discovering the Moon asks deep questions and challenges readers, in a relatable and gentle way, to live up to the teachings and expectations of their own religious beliefs the same way that Fern does upon turning fifteen.