Poirot: Three Act Tragedy (2010)

A unique hybrid: a medieval royal palace with a 1930s Art Deco mansion grafted into it by millionaires Stephen and Virginia Courtauld. Cross a 15th-century stone bridge over the moat to enter the courtyard. The Great Hall dates from the 1470s with a magnificent hammerbeam roof — one of the largest in England. The Courtauld interiors are the real draw: the circular entrance hall features a concrete dome with glazed lantern, blackbean-veneered walls, and a marquetry world map in the floor. Virginia Courtauld's bathroom has gold mosaic tiles and an onyx bath. These interiors have doubled for 1930s Hollywood dressing rooms (Stan & Ollie), a royal yacht cabin (The Crown), and a chocolate baron's office (Wonka). The 19 acres of gardens include a sunken rose garden, herbaceous borders along medieval moat walls, and formal lawns. Light enters the entrance hall through the dome's lantern, creating dramatic top-lit effect. English Heritage managed; commercial filming requires formal hire agreement.