about seven o'clock
`` And it is turned to display an advertisement . I wonder if Frank could have gone to answer this ? '' and he read the item concerning the sanitarium . It was about seven o'clock that evening when Frank , wearing the smoked glasses , rang the bell at the front door of the Cliffside Sanitarium . He had hurried through the woods as fast as he could , munching on the way a sandwich he had made before leaving camp . His ring was answered by a woman with iron-gray hair who inquired what he wanted . When he said he had come in answer to the advertisement , he was shown into a little room opening from the main hall , and told to wait until Dr. Hardman came .