Cordelia ia a troubled, damaged soul who is only just recuperating after some unnamed trauma; she is an actor rehearsing a play and involves remain in a creepy London mansion flat inhabited by her twin sibling Caroline and also Caroline's sweetheart Matt. When they leave her alone there Cordelia strikes up a relationship with Frank the enchanting, however strange and unstable boy they can listen to practising his cello in the upstairs level-- a partnership which promptly comes to be really troubling.