A group of youngsters get a permission from the mayor to restore an old building to make it a youth cultural center. Workers find a skeleton in the building. And the youngsters find a bag with letters which have never been delivered.
A woman visits the building saying she is touched to come to her childhood house after years. But Magda suspects she's lying because she was seen the week before. During the night someone breaks into the building.
Reading another one of the "lost letters" leads the 5 friends to meet an old-fashioned romantic writer who claims he has murdered a younger modern writer he despised.
Another letter leads the group of friends to visit the correctional facilities in order to resume efforts for an innocent man to be released and for the guilty one to be imprisoned.