Unfortunately, her niece, Belinda, has recently absconded from Nyth y Ddraig with 1) a newly-hatched white dragon, 2) over a dozen (unhatched) dragon eggs, and 3) an extraordinary surfeit of hubris. All clues lead to London, and so Mildred and company have no choice but to follow her to town.

But retrieving a hoard of dragon eggs in the middle of a vast city is no easy task, especially when confronted with such impediments as journalism, pelicans, and a certain Prince Regent. Now Mildred must do everything in her power to return the stolen eggs to Wales - before they hatch! - and finally carve out the life for herself she has always wanted.