about ten o'clock
`` What Grandfather asked me to do was to run out here in the car some day , and , if there was no one about , to scout around and see if I could discover any clue to the mystery , without attracting attention . He supposed , of course , that the beach was by that time entirely deserted . I came out the very next day , but found to my disgust that the cottage next door was occupied -- by you , as I now know ! But I felt it would not be wise to be seen about here in the daytime , so , without saying anything to Grandfather -LRB- who would be awfully upset if he knew it -RRB- , I determined to run out about ten o'clock that night and scout around when you people would probably be in bed . `` And here is where Ted comes into it ! I got here that night as I had planned , found no one about , and tried the experiment of getting into the side door , as Grandfather had explained , but I found it very difficult ; in fact , quite impossible -- for _ me ! _ And while I was fussing with it , I was suddenly startled by a low voice , right behind me , inquiring _ very _ politely what I was trying to do !