about
6:30
Her maid answered -- with the information that Mrs. Clephane had been out since five o'clock and had not yet returned . Harleston thanked her , hung up the receiver , and turned to Banks . `` I have reason to believe that Mrs. Clephane , who is a guest of the hotel , has disappeared . I was talking to her in the red-room at about 6:30 , when I was called to the telephone . On my return , after a brief absence , she was gone , and a frequent and thorough search on the first floor did not disclose her . She was to have dined with me at seven-thirty . She did not keep the engagement .