Windswept

Margi Preus, a gripping middle-grade fantasy about a girl who must save the children of her world from being "windswept"
In Tag's world, children are disappearing. "Youngers" who venture Outside are windswept-vanishing in the swirling snow-Tag's sisters among them. Many have tried to find the lost children, all have failed. And since the Other Times, the Powers That Be seem intent on keeping it that way.
Little remains from those times: snippets of songs, heaps of plastic trash, and a few banned texts-including a book of fairytales.
An unlikely crew of Youngers join forces-Boots, who can climb anything, Ant, who will eat anything, Ren, who will say anything, and Tag, who doesn't appear to have any talent whatsoever. With their dubious skills, the fairytales, a possibly magic ribbon, and an unwillingness to accept "that's impossible," they set off to rescue their windswept siblings in this spellbinding fantasy.