The 10 million copy international bestselling author Jussi Adler-Olsen returns with the fifth crime novel in the Department Q series Over three years ago, a civil servant vanished after returning from a work trip to Africa Missing, presumed dead, the man's family still want answers It is one of the many unsolved crimes facing Department Q, Denmark's specialist cold case unit headed up by Detective Carl Morck But what Carl doesn't know is that the key to the investigation can be found right here in CopenhagenFifteen-year-old Marco Jameson is tough, smart and very suspicious of police Sleeping rough and hiding in the shadows is his way of life But what does he know worth killing for - and will the police find him before whoever he is running from? Jussi Adler-Olsen has sold over 10 million books worldwide and is the award-winning and internationally bestselling author of the Department Q thrillers The series includes Disgrace, Redemption, Guilt and The Keeper of Lost Causes, now a major Danish language movie, which was first published in the UK as Mercy