a quarter past twelve
`` I think the only thing for us to do , '' I said , `` is to tell what we know , and save Ivor in spite of himself . '' `` How can anything you know save him ? '' she asked , with a queer , faint emphasis which I did n't understand . `` Do n't you see , '' I cried , `` that if we come forward and say we saw him in the Rue d'Hollande at a quarter past twelve -- going into a house there -- he could n't have murdered the man in that other house , far away . It all hangs on the time . '' `` But you did n't see him go in , '' Lisa contradicted me . I stared at her . ''