The first crime scene was the most disturbing. From the looks of it, the killer had dipped their fingers in the victim's blood and used it to write in dark red on the white wallpaper. Although the letters were smeared and uneven, Detective Niklas Steg had no trouble making out the message: "Reap the storm." Now, with the help of Private Detective Sabrina Lampe, Steg must hunt down a terrifying serial killer dead set on delivering a particularly gruesome form of justice on men with a history of violence against women. Before each slaughter, the murderer sends a note to the intended victim that simply says, "Sow the wind...." When an innocent man receives the warning, Steg and Lampe race to crack the case before he, too, meets a brutal end.