English Summary/英文概要： Buckingham Palace, 1951

After the devastation of World War II, the nation is finally on the road to recovery. And so is Milly Hendry. After her parents died in the Blitz, Milly was taken in by her aunt - a cleaner in what is known as the Royal Army of Cleaners at Buckingham Palace.

The palace, and the people who work there, have become a family to Milly. On the cusp of her twenty-first birthday, she is getting ready to celebrate with her beloved friends from below the royal stairs and, in particular, the dashing footman, Timothy.

But the King’s health is declining, and tensions in the palace are rising.

And then a devastating letter arrives for Milly - a letter containing secrets from the past that could change her whole future...