At a Berlin landmark a kidnapper abandons his victims, with a box containing a personal ‘memento’- to perpetually remind them of their ordeal. What connects these men to their abductor nicknamed Colossus? Has he an old score to settle? An intriguing game of cat and mouse for Hanne Drais, the criminal psychologist working on a case within a Berlin Police team led by her irascible boss Oskar Kruger and his laid-back deputy, Stefan Glockner. Their investigations unravel a tale of altruistic justice and revenge resonating from the former communist East Germany to a reunified Germany where undertones of extremism continue to exist. The past must be uncovered before the present is held to account.