Isabella Valentine had the kind of name that hinted at novels and neon lights. She lived in a city of perpetual twilight—skyscrapers rimmed in copper, rain that smelled faintly of oranges, and a subway system that purred like a contented cat. By day she cataloged curiosities at the Municipal Archive: boxes of theater posters, brittle blueprints, a drawer full of wartime fortune-telling cards. By night she chased luck.