On the surface, the crime seems simple. A bank's secure safe is robbed. One of the two men who holds the key must be guilty. One key-holder is the bank's owner who lives above the bank with his family, the other is the bank's trusted manager-a man like a son to the owner. What if neither is guilty? How did this safe, with every security measure known and employed at the time, get robbed? Leave it to Monsieur Lecoq of the Surete, a policeman of many disguises and much guile to uncover the devastating truth of deceit, betrayal, lies, murder and sordid family histories that lead to the crime.