Gilly Macmillan is the New York Times bestselling and Edgar-nominated author of What She Knew, The Perfect Girl, Odd Child Out, I Know You Know, The Nanny, To Tell You the Truth and The Long Weekend. She grew up in Swindon and studied at Bristol University and The Courtauld Institute of Art in London. She has worked at The Burlington Magazine and the Hayward Gallery and has been a lecturer in photography. She now writes full-time and lives in Bristol with her family.