six o'clock
`` Here are three letters ; one for M. de Chalabre , one for M. de Biron , and one for yourself . M. de Chalabre will command the first party , M. de Biron the second , and yourself the third . '' `` Good , monsieur . '' `` These letters are only to be opened at six o'clock . M. de Chalabre will open his at the Porte St. Antoine , M. de Biron his at the Croix Faubin , and you yours on your return . '' `` Must we come quickly ? '' `` As quickly as possible , without creating suspicion .