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 people 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 new legendary ball, one family's life will change forever.

Eagerly visiting New York to escape her suffocating family, young Englishwoman Sophie clashes with her hostess's arrogant grandson, who follows her back to England with an unconventional proposal.

A satirical glimpse into Manhattan's upper class follows Nanny, a struggling NYU student who takes a position caring for the son of the rich and glamorous X family, as she learns how to juggle a vast array of tasks so that a Park Avenue wife never has to lift a well-manicured finger.

"With her inquisitive mind, Charlotte Holmes has never felt comfortable with the demureness expected of the fairer sex in upper class society. But she never thought that she would become a social pariah, an outcast fending for herself on the mean streets of London. When the city is struck by a trio of unexpected deaths and suspicion falls on her sister and her father, Charlotte is desperate to find the true culprits and clear the family name. She'll...

The follow-up to the 2019 feature film in which the Crawley family and Downton staff received a royal visit from the King and Queen of Great Britain.