On a poor Kentish farm, six sisters–Grace, Willa, Freya, and triplets Deedee, Darcy, and Dolly–live in fear of their violent father. Their beloved grandmother tries to protect them, but the future seems bleak. When the Full Moon Fayre makes a rare visit to Hollow-in-the-Marsh, the girls slip out to see the famous Shadow Man, an enigmatic puppeteer. Afterwards, the oldest sister Grace is missing. Can twelve-year-old Willa save her sister from one fate and yet outrun her own?