On the day the Songoli's young son fails to come home from school, 14-year-old Muna's life gets better. Until then, her bedroom was a dark windowless cellar, her activities confined to cooking and cleaning. She had grown used to being abused by the Songoli family - to being their slave. She's never been outside, doesn't know how to read or write, and cannot speak English. At least that's what the Songolis believe. But Muna is far smarter and her plans for revenge are terrifying.