The king in the window
by Adam Gopnik

Eleven-year-old Oliver, an American boy residing in Paris, discovers, much to his astonishment, that phantoms live within the windowpanes and have selected Oliver to lead a war against the "soul-stealers" that inhabit mirrors.
Adventure and adventurersAmericansFictionGlassMirrorsSupernaturalChildren's fictionSupernatural, fictionFantasy fictionAdventure and adventurers, fictionParis (france), fictionAmericans, europe, fiction