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Shades of Magic by V.E. Schwab - The Four Londons

“You don’t know anything about these worlds,” he said, but the fight was bleeding out of his voice.
“Sure I do,” countered Lila cheerfully. “There’s Dull London, Kell London, Creepy London, and Dead London,” she recited, ticking them off on her fingers. “See? I’m a fast learner.”