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?