Muna's bedroom is a dark windowless cellar and her activities are confined to cooking and cleaning. She's grown used to being maltreated by the Songoli family; to being a 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 cleverer - and her plans more terrifying - than the Songolis, or anyone else, can ever imagine ...