Only 22 years old, he experiences that Norway is occupied. Gunnar is becoming increasingly involved in illegal work. By the Germans, he eventually denounced as a dangerous terrorist.
Gestapo steps up the hunt for "Nr. 24", and Gunnar have to leave the country. In England await security checks and rigorous training, and the Norwegian agent encounters unexpected problems.
"Nr. 24" is back in Norway to direct sabotage against occupied forces.