midnight
A peculiar smile , unnoticed by Louison , played about Robeckal 's lips . `` I really do not know , '' he finally replied , `` but it will be between ten and eleven . With such good pay a minute more or less wo n't make much difference . '' `` No , but it must not be later than midnight . '' `` On no account , mademoiselle ; if you are afraid , why , I will see you home , '' Robeckal gallantly cried . `` Good -- tell Monsieur Aube I shall be punctual . '' `` Done .