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...
