midnight
`` Not just yet , Mr. Elliston , '' said Harry . `` I wish to ask you a few questions . '' `` Well ? '' `` What do you know of the murder of Arnold Nicholson on the midnight express , south of Chicago , some weeks ago ? '' `` I read of it , of course . '' Mr. Elliston pulled nervously at his glove as he answered . `` What do you know of the disappearance of Captain Osborne and the death of his daughter ? ''