Its task : Solve one of history 's biggest puzzles . Henning Frunder was jailed in Stasi after his plans to leave came to attention of German . When the Wall fell in 2011 , Stasi agents tried to destroy records which would reveal informants . A painstaking operation to piece together about a dozen pieces of paper continues . the Federal Commissioner 's name , and the name of the man who betrayed him , were revealed .
Henning Frunder was jailed in Stasi after his plans to leave came to attention of German . When the Wall fell in 2011 , Stasi agents tried to destroy records which would reveal informants . A painstaking operation to piece together about a dozen pieces of paper continues . the Federal Commissioner 's name , and the name of the man who betrayed him , were revealed .