She’s a historian, bestselling writer and researcher, whose books include a biography of her grandfather, Sandy Irvine, the man who built the ‘real’ bridge over the River Kwai. Returning to the era of World War Two, Our Uninvited Guests offers behind-the-scenes glimpses of life in some of Britain’s greatest country houses occupied by people who would never otherwise have set foot in such opulent surroundings. Blenheim Palace was taken over by schoolboys; Polish special agents trained in the grounds of Audley End House, and Brocket Hall was used as a maternity home for women. There are Poles, Czechs, French, Dutch, Norwegian and Germans nestled behind these rather grand closed doors. Some good, some bad, some just plain evil but all fascinating in one way or another.