Something Wicked This Way Comes by Ray Bradbury

Cooger & Dark's Pandemonium Shadow Show crept into town late one night to the eerie whine of a calliope. In the fearful days that followed, a schoolteacher suddenly became a little girl, a rosy-cheeked boy became a wizened Methuselah, a full-grown man became a tiny dwarf. It was Jim and Will, two thirteen-year-old boys, who first stumbled into the grisly secrets of the Show-the sinister merry-go-round, the wax museum of living people, the strange mirror that stole souls. But it was not until they had actually become part of its evil seductions that they discovered the most awful secret of all...

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