A little girl who plays in and around Djupelv finds the remains of a body. The family won't be involved in anything and tip off the police anonymously, but later that day, the girl runs off from home and disappears mysteriously.
During an arrest, a suspected man is shot and killed by a recruit before the police got to question him. The newspaper puts it on the cover, but Mia grabs completely new information that turns the case on its head.
Several traces point to Thomas' own family, but some are obsessed with preventing him from revealing the truth and stabbing sticks in the reels for investigation.
Thomas and Mia reveal that more in the police and in the armed forces are concealing a great scandal from the cold war. They escape the village with special soldiers in their heels - deciding to go across to Russia to reveal the whole truth.
Mia and Thomas have fled from the village, and are on their way to Russia to find the infamous double agent. But they are being chased and the situation becomes extremely dramatic.
The mystery around Silja's death is cleared up, high on the mountain lies the solution - a horrible secret The Armed Forces have tried to cover all the years.
