A closed case hides a terrible secret . . . Department Q solves the unsolvable. So when a file on the brutal murder of a brother and sister 20 years ago lands on the desk of Detective Carl Morck, he doesn\"t understand why. Because the killer has already been found, and the case is closed. Why has it turned up on Carl\"s desk?...

One boy is on the run from an international conspiracy . . . Over three years ago, a civil servant vanished after returning from a work trip to Africa. Presumed dead, his family still want answers. It\"s up to Department Q, Denmark\"s cold cases department, to find out the truth....

She scratches at the walls until her fingers bleed. But there is no escape. She doesn\"t know how long she\"s been there. She vows not to go mad. She would rather die. Copenhagen detective Carl Morck has been taken off homicide to run a newly created department for unsolved crimes....

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 Copenhagen\"s cold cases division Carl Mшrck has received a bottle. It holds an old and decayed message, written in blood. It is a cry for help from two boys....

Jussi Adler-Olsen returns with his most captivating and suspenseful novel yet... In a Copenhagen park the body of an elderly woman is discovered. Though the case bears a striking resemblance to another unsolved homicide from over a decade ago, the police cannot find any connection between the two victims....

In the middle of a hard-won morning nap in the basement of police headquarters, Carl Morck, head of Department Q, receives a call from a colleague working on the Danish island of Bornholm. Carl is dismissive at first, but then he receives some shocking news....

The Keeper of Lost Causes (originally published in the UK as Mercy) is the nail-biting first book in the internationally bestselling Department Q series. At first the prisoner scratches at the walls until her fingers bleed. But there is no escaping the room. With no way of measuring time, her days, weeks, months go unrecorded....