midnight
He had strolled along the front and round Brunswick Square . Marley shrugged his shoulders . `` Well , it 's a bit of a puzzle to me , '' he admitted . `` You go out for a midnight walk -- a thing you have never done before -- and when you come back you find somebody has got into your house by means of a stolen latch-key and murdered somebody else in your conservatory . According to that , two people must have entered the house . '' `` That 's logic , '' David admitted . `` There can be no murder without the slain _ and _ the slayer .