During a military exercise on Gotland, thousands of soldiers are mobilized on the island. A sudden explosion occurs in a military protection area and a young soldier loses his life.
A lifeless teenager is fished out of the sea off Gotland and it is discovered that he has escaped from a youth home on the island. Shortly afterwards, another teenager disappears.
A man is found shot on an old man's property. Because the dead person was poaching on his neighbor's land, it is assumed that the old man shot him. Unfortunately, he has dementia, which complicates the investigation.