"In the penultimate thriller of the New York Times and #1 internationally bestselling Department Q series, the team must hunt for a nefarious serial killer who has slipped under the radar for decades. On her sixtieth birthday, a woman commits suicide. When the case lands on Detective Carl Mørck's desk, he can't imagine what this has to do with Department Q, Copenhagen's cold cases division. It's a tragedy to be sure, but the cause of death seems...