I was delighted to find this review of City of Masks by Ben Rovik, whose Mechanized Wizardry books I've been enjoying. He says in part:
This book has all the twists and revelations you’d expect from a story of courtly intrigue, and all the mistaken identities you’d expect from a story where everyone wears masks. There are thoughtful themes about identity woven throughout.
Always nice when someone spots the theme. Thanks, Ben!