The film follows a group of kids in a small village who set out during winter break to hold a massive snowball fight. 11-year-olds Luke and Sophie find themselves leaders of the opposing sides, with Sophie’s faction defending an elaborate snow fort against Luke’s. Whichever side controls the fort by the end of the break will be declared winner. However, what begins as a fun contest deteriorates into a more bitter conflict teaching the children valuable lessons about friendship, the importance of unity, and the emotional consequences of vicious rivalry.