Eily and her father live in Ireland, three fields from the sea, within sight of the enchanted isle of Lisnashee. The fairy folk who live there cause mischief and harm to any who trespass, but once a year at Midsummer, Eily’s father, the Fog Catcher, rows out to collect magic from the fog around the island. His sole protection is a charm tucked in his pocket, and when Eily finds the lost charm in a hedgerow after he departs, she knows at once what she must do.