eleven o'clock
`` No , if I did meet somebody , I 'm sure it must have been one of the cadets . But who it was , I ca n't think . '' A little later Colonel Colby continued his investigation by asking all those who had been inside the building during the celebration to come forward and tell anything they could that might be of advantage . It developed that not only Ned but also Ralph Mason , Bart White and two of the older cadets named Lawrence and Philips had been upstairs some time between eight and eleven o'clock . The most of these cadets said they had seen no one else upstairs in the building . But Bart White declared while at one end of a long corridor he had seen some one slip around a corner out of sight . He was not sure whether the person had been a cadet , one of the hired help , or an outsider .