midnight
`` By God ! It 's Hawke , himself ! '' he shrieked . `` Alan Hawke , a midnight robber ! '' But , Harry Hardwicke , with the two men at his back , had dashed on into the gun-room of the old tower , leaving Murray with his prostrate foe -- empty , not a sign of any human presence . With one wild cry Hardwicke turned to the door , `` Nadine ! Nadine ! ''