 CONT: The morning Suzy arrives at the school, Miss Tanner tells Suzy  that they were expecting her the night before. Suzy replies that she  had arrived at the school the night before, at 10 oclock, but the  door was locked. However on her way up the staircase, when Madame  Blanc is explaining to the officers about the murdered girls  expulsion, Suzy interrupts to say she saw a girl leaving when she  arrived at 11.