six o'clock
`` And suppose he does not come ? '' M. Desmalions once more exclaimed , in a more vehement tone . `` Then , Monsieur le Préfet , you may take it that I am the culprit ; and you have only to arrest me . This day , between five and six o'clock , you will see before you , in this room , the person who killed the Mornington heirs . It is , humanly speaking , impossible that this should not be so . Consequently , the law will be satisfied in any circumstances . He or I : the position is quite simple . ''