twelve o'clock
She will take what steps she thinks right in bringing you to order , and in discovering the author of this mischief . Return instantly to your desk , Miss Russell ; you strangely forget yourself . '' Miss Good left the room , having removed the plum-cake and `` Turkish delight '' from Dora Russell 's desk , and lessons continued as best they could under such exciting circumstances . At twelve o'clock that day , just as the girls were preparing to go up to their rooms to get ready for their usual walk , Mrs. Willis came into the school-room . `` Stay one moment , young ladies , '' said the head-mistress in that slightly vibrating and authoritative voice of hers . `` I have a word or two to say to you all . Miss Good has just brought me a painful story of wanton and cruel mischief .