It is 1943. Although the Netherlands has been under Nazi occupation for three years, for Tuura and Lambert, 12-year-old best friends, World War II is something distant - they run through forests with wood-carved weapons, hide in caves and go to the day by day school. And only sometimes they have to go down to the basement to hide from the raid. With time, however, the war, the real one, reaches them into their city. The Tuura family engages in the resistance movement, while Lambert's dad collaborates with the Nazis and persuades his son to join the Hitler Youth. In spite of their differences, Tuur and Lambert remain friends. However, when Maartje joins the boys' class, everything changes. Jealousy divides friends, and the cooperation of the family with the Nazis pushes his colleagues away from Lambert. A discontented, lonely boy betrays a seemingly innocent secret. Everything is heading for an inevitable catastrophe.