Description du livre
  
                           
                          
              
                               1963. As Professor Mortimer is invited to the USSR by an old
          archaeologist friend to join in the search for the lost city of
          Arkaim in the Urals, Captain Blake goes to Switzerland for an
          important conference between the intelligence services of the Western
          Powers, in order to prepare for the top-secret Operation Prince in
          Berlin. Berlin where a West German agent was just shot trying to
          cross the Wall back from East Germany, uttering a single word before
          dying: doppelgänger …