three o'clock in the morning
Don Luis pricked up his ears . Those two other sheets had escaped his attention on the day of his interview with Florence in this room . `` Here is one of them , '' said Weber . M. Desmalions took the paper and read : `` Bear in mind that the explosion is independent of the letters , and that it will take place at three o'clock in the morning . '' `` Yes , '' he said , `` the famous explosion which Don Luis foretold and which is to accompany the fifth letter , as announced on the list of dates . Tush ! We have plenty of time , as there have been only three letters and the fourth is due to-night .