Summer evening. Unbearable heat. Investigator Erica Foster is called to the crime scene. The young doctor was found strangled in his own bed. His wrists are tied, a plastic bag is put on his head, dead eyes are staring out in pain and horror. A few days later, another corpse was discovered. Erica and her team conclude that a pedantic serial killer is behind the crimes, who tracks down his victims for a long time, choosing the right moment to attack. All those killed are single men who led a very closed life. What secrets envelop their past? And what links them to the killer?