The story is told by Coriander, daughter of a silk merchant in 1650s London. Her idyllic childhood ends when her mother dies and her father goes away, leaving Coriander with her stepmother, a widow who is in cahoots with a fundamentalist Puritan preacher. She is shut away in a chest and left to die, but emerges into the fairy world from which her mother came, and where time has no meaning. When she returns, charged with a task that will transform her life, she is seventeen.