six o'clock
They reached a passage in a miserable street . At the mouth stood two of Green 's men , planted there to follow Skinner should he go out : but they reported all quiet . `` Bring the old gentleman up , '' said Green . `` I appointed him six o'clock , and it 's on the stroke . '' He then descended the passage , and striking a light led the way up a high stair . Skinner lived on the fifth story . Green tapped at his door .