The third princess is not a villainess
Or, perhaps I should say, she *might* be a villainess, but she is also a pure joy to read about. These books are a simple, unadulterated delight! The plots are amusing, well structured and VERY entertaining, the characters are solidly written and mesh well together, and no detail gets left behind or forgotten. It all meshes like the intricate clockwork of the handmaiden Coppelia (who pretty much steals the show for me I must admit)
Anyway, 4th book, surely you know what you are in for by now? Hijinks, mayhem and sharply pointed humour that is both well observed and wryly self-observational, occasionally breaking the 4th wall in the very best ways. Prepare to be royally entertained (again)!