Blake & Mortimer - Volume 29 - Eight Hours in Berlin

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 …