The Alternate Next Door

The new kid next door looks exactly like Dex. Same height, same hair, same laugh. Then he starts showing up to school wearing Dex's clothes from yesterday. Then finishing Dex's sentences. Then Miles finds a photo on the kid's phone — a photo of Dex sleeping, taken from inside Dex's bedroom. The kid isn't copying Dex. He's replacing him. And the adults can't tell the difference anymore. Doppelganger horror for the Mandela Catalogue generation.