A secret unravels behind the porticoed doors of London's grandest postcode. Set in the 1840s when the upper echelons of society began to rub shoulders with the emerging industrial nouveau riche, Belgravia is peopled by a rich cast of characters. But the story begins on the eve of the Battle of Waterloo in 1815. At the Duchess of Richmond's now legendary ball, one family's life will change forever.