Rowan's mother went missing seven years ago. On the anniversary of her disappearance, Rowan cries herself to sleep beneath their favorite tree in Hyde Park, in the very heart of London. When she wakes up she's tiny...and has wings.

She uncovers a hidden world of fairies and foxes, and sets out on a perilous journey to find the one person she misses more than any other. With new friends by her side and fierce enemies at her heels, she'll discover powers she never imagined, and a courage she never knew she had.