Gamelofts BackStab

Hey folks,
Got a problem playing gamelofts backstab. Havn't played for a while now, because of that. I am in puerto imperio - inquisation ii. I have to listen to sadiqs mem near the cathedral picture 3, but i am not. Able to get there, if i go to the exit (picture 4) i get the message, "you can't leave, you havn't finished your work. But how do i get to them than?

Pleasehelp me on that. Thanks


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