midnight
`` Now , Professor Lambert , your explanation of Miss Crawford 's disappearance does not sound logical to us , but still we are willing to give you every chance to bring her back , if what you say is true . We can not leave you entirely alone , because you might try to escape or you might carry out your threat of suicide . Therefore , I am going to sit over there in the corner , quietly , where I can watch you but will not interfere with your work . We will give you until midnight to prove your story . Then you must go with us to the district attorney . Do you agree to that ? '' * * * * * Lambert nodded , eagerly .