midnight
`` Mine was , '' came from Sam and Dick . `` I do n't remember exactly how I did leave mine , '' said Tom . `` But I did n't notice anything unusual . '' `` Then , if the real thief visited our camp he must have come in between midnight and six o'clock , '' went on the master of the school . `` I must question those who were on guard duty about this . '' `` That 's the idea ! '' cried Dick .