midnight
He would tell him merely that there were suspicions of a proposed attempted robbery , and ask leave to station detectives . `` And I 'm to stay here with Simon , I suppose , '' I said despondently , `` until everything is finished . '' `` Not a bit of it , '' he answered . `` Simon will stay here , and with him a detective who will arrive to-night at midnight . We may need you at Eldon Hall , and you must be there . '' `` Meet you there ? But I have promised those men that -- besides , supposing that I am seen . ''