Stalker

"The Stockholm Police are sent a video of a woman being candidly filmed through her window. They conclude that in order to make the film, its creator must have been standing in the garden just outside. The next day the woman is found dead in her home, and the viciousness of her killing shocks even the most seasoned of the investigators called to the scene. A few days later, another clip is sent to the police. There is no way of identifying the woman before she, too, falls victim to a brutal attack. When the woman’s husband finds her, he is so traumatized that in a state of panic, he starts scrubbing away the evidence of the violence that has invaded his home. Even washing the blood from his wife’s body, he quietly puts her to bed, as if she were only sleeping. Chance is he has seen a clue vital to finding the killer, but the extreme shock has triggered a short-term memory loss and the police are unable to fully question him. Criminal psychiatrist and hypnotist Dr. Erik Maria Bark is called in to hypnotize the husband, hoping to unlock his memories of the murder scene. But what Dr. Bark uncovers in his sessions has him deciding to hide the truth from the police. It grows increasingly clear that the case cannot be solved without the help of Detective Inspector Joona Linna, the man who has been missing for more than a year and is presumed dead." -- from the Lars Kepler website.