eight o’clock
`` Tell me , at once , what has happened . '' In the midst of real danger Miss Stuart was a different woman , as Mr. Stuart well knew when he allowed her to chaperon the automobile girls . Mrs. Ewing had nothing to tell . All she knew was that the girls had gone out for a long walk , and , at eight o'clock , had not come back . `` Come with me , Ralph , '' Miss Sallie demanded . Grace and Mollie followed them . `` Do n't be frightened , Mollie , '' Grace begged , trying to talk cheerfully , though she was trembling violently .