Goodnight Sweetheart by Charlotte Bingham
A romantic wartime novel encompassing both love and tragedy. As Walter Berrisford paints beautiful Katherine Garland, she asks him to put a ladybird on her finger without his knowing why. He is appalled when he discovers that Katherine is a Nazi. The outbreak of war means that her sister Caro and her friend Robyn join the FANYs, while former maids, Betty and Trixie, work in a factory. War brings frantic romance to all, including their flatmate Edwina O'Brien, but it is Betty, transferred to decode at the Park that alone discovers the truth about the Ladybird. "From the Trade Paperback edition."