four o'clock
She selected a frock and putting it on opened the door . Belshazzar arose and offered this letter : DEAR RUTH : I have gone to keep my promise . You are locked in with Bel . Please obey me and do not step outside the door until four o'clock . Then put on a pretty white dress , and with the dog , come to the bridge to meet me . I hope you will not suffer and fret . Put away your clothing , arrange the rooms to keep busy , or better yet , lie in the swing and rest .