The Shadow Men by Christopher Golden
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Imagine if one day, your whole family disappeared, but no one else remembered they ever existed. In "The Shadow Men," a man faces this horrifying scenario as his family vanishes into thin air, seemingly erased from reality. As he digs deeper, he discovers an alternate version of Boston, a shadow city controlled by dark entities. A city within a city, a tale of alternate realities; this story delivers multiple layers of existential dread mixed with adventure. Think of it as a philosophical thriller for the spatially adventurous.