Following a complicated but successful dismantling of a hostage situation, Detective Paul Hjelm is facing the prospect of a potentially career-ending investigation by Internal Affairs. Instead, he finds himself dropped into a new elite team of officers selected from across the country, whose mission is to find an elusive killer who has been targeting Sweden's business leaders. The killer's modus operandi, two distinctive shots straight through the head, bullets carefully pulled from the wall, a nighttime ritual enacted with Thelonius Monk's jazz classic Misterioso playing in the background.