A group of terrorists posing as plumbers set up base at a school for the blind. The students remain blissfully unaware while the terrorists plan the assassination of a politician who will soon be passing the school on a parade route. Only one student, Sally, suspects that the men upstairs may be dangerous...

Upstairs: the wealthy, aristocratic Bellamys. Downstairs: their loyal and lively servants. For nearly 30 years, they share a fashionable townhouse at 165 Eaton Place in London’s posh Belgravia neighborhood, surviving social change, political upheaval, scandals, and the horrors of the First World War.