Set in occupied France, Lebrac leads a play war between two rival kid gangs, but when his feelings for Violette, a Jewish girl in danger of being discovered by the Nazis, get stronger Lebrac realizes he must face the reality of what's happening around him.
Director Christophe Barratier adapts author Louis Pergaud's novel set in the French countryside during World War II, and following the escalading feud between two groups of youths from rival villages who seek to collect the buttons of their enemies.