Sweet sleep

A good night's sleep by Anders Roslund ... When investigator "Evert Grens" goes to visit his wife's grave, he finds a woman sitting in front of her daughter's grave, the two engage in a conversation, to learn from her that her daughter's grave is actually empty, she disappeared years ago and the Swedish police considered her dead. However, a chance discovery prompts "Evert Grens" to reopen her case. Driven by a psychological shock he experienced earlier in his life, he is determined to find out what happened to the girl who vanished without a trace. The investigation leads him to disgusting secrets of a gang that exploits children sexually. Then, "Evert Grens" finds himself forced to call his retired colleague "Biet Hovman," the best secret agent he knows, to try to infiltrate that gang. The two find themselves facing only one chance, but are they prepared for the toughest challenge of their lives?