When the wall of the Old South Church is the body of a tramp. At first glance, he died of natural causes, but the coroner found that it is something else: the man is a very special way have been killed and De Cock realizes that he has refined a murderer to do. The victim appears to be a wealthy baron who was known for his eccentric lifestyle. But the place where he was found is not a noble life. De Cock gets a strange family and makes a discovery to him on the trail of the perpetrator sets: a double found. But who is the real 'baron'? Another mystery in which the sagacity of the Cock is required.