Dream Thief — Blaze Ward

An anarchist assassin threatens all royal families, everywhere. Helpless, His Majesty's Government summons Augustus Dexter Derlyth, metaphysician and scoundrel to solve this trouble. They might be fighting fire with fire. And everyone wears a mask of some sort. Dream Thief, second in a new Occult Detective series set in 1920s London, where all is not as it seems. Be sure to read Ill Tidings first, then look for Equal Before The Blade.