About six o'clock
As a matter of fact , however , the detectives had little to do on Saturday and Sunday . Only three of the girls made shopping trips on Saturday and all took an automobile ride Sunday afternoon . This was the sum total of their activities away from the Stanlock home , with the exception of one instance , of which there was no hint until late in the afternoon . About six o'clock Marion suddenly became mindful of the fact that she had not seen Helen since their return from the automobile drive three hours earlier , and she began a search for her . She first went upstairs to her room to see if her friend were there . Probably she was tired and had lain down to rest and fallen asleep . But an inspection of the room failed to discover Helen .