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When Greg Hefley's school is closed due to a snowstorm, the whole neighbourhood turns into a winter battlefield. Warring factions compete for territory, build strong snow fortresses, and stage epic snowball fights. Greg and his trusty best friend Rowley Jefferson are caught in the crossfire. Greg and Rowley manoeuvre between allies, traitors and warring gangs in a battle for survival that has engulfed the entire neighbourhood. When the snow clears, will they crawl out from under it as heroes? Or will they survive to see another day?