nine o'clock
As she moved away the two detectives passed by her . `` Not there ! At any rate , '' she heard one of them say . `` Maybe they got him by the nine o'clock at Waterloo . '' `` More likely trapped him in Guilford Terrace , '' replied the other . Erica , shaking with suppressed laughter , saw the men leave the station ; and then , springing into a cab , drove to a street in the neighborhood of Guildford Square . Now that her work was over , she began to feel what a terrible strain it had been .