Jessica - The Reinhart Conspiracy.

Jessica Andersen and Dieter Lange have spent several weeks at their residence in Sonnenburg; the affluent northern district of Wiesbaden, following the successful conclusion of the investigation into corrupt municipal officials and particularly, the corrupt Wiesbaden Mayor Klaus Brenner.Recalled to the Bundeskriminalamt Headquarters; Kommissar Eva Reinhardt allocates them a new assignment.Opening a slender file on her desk, she began..."A high-level defector from the old East German archives who claims he has proof that the Stasi didn’t just monitor the Berlin Wall; apparently the architects who designed it built in redundancies, secret passages, rooms that didn't appear on any plan; tunnels that were never mapped, never filled, and currently being used to move 'something' into the heart of the city.; and also  useful entry points for Stasi agents to sneak unseen into West Berlin.” It is, they say, named "Projekt Spuk"... Find out what this is all about."