**THE INSPIRATION FOR MAJOR NETFLIX SERIES DEPT. Q, STARRING MATTHEW GOODE!** The third book in Jussi Adler-Olsen's internationally bestselling Department Q series. __________ A letter in blood, a horrifying disappearance. . . Two boys, brothers, wake up tied and bound in a boathouse by the sea. Their kidnapper has gone, but he'll be back. They cannot escape . . . In the cold cases division Carl Mørck has received a bottle. It holds an old and decayed message, written in blood. It is a cry for help from two boys. Is it real? Who are they and why weren't they reported missing? Can they possibly still be alive? He needs to find out, and fast . . . Praise for Adler-Olsen: 'The new "it" boy of Nordic Noir' The Times 'Engrossing' Sunday Express 'Adler-Olsen's fascination with abnormal psychology once again pays off' Sunday Times