Olsen Banden's Last Plan

Vridsløselille is being torn down, but everything still stands as it was when it was abandoned. No one has touched anything since the last prisoners left the place. Perhaps there is something hidden in Egon Olsen's old cell that could make the lucky finder filthy rich? The rumor has it that he hid a plan that can break into a hidden safe, which is supposed to be in the old prison inspector's office. The safe contains a red folder filled with 5 million kr. Your task is to find the plan and the money before the prison is demolished and they are lost forever!