Go to a lone house at Lambeth, with moss-grown steps down to the water's edge.
Go by thine own wherry thither, and go alone.

Thou canst not mistake the house.

There is none like it besides.

It stands upon the water, and none other building is nigh at hand; but a giant elm overshadows it, and there is a door scarce above high water level and steps that lead from it.

Knock three times, thus, upon that door"-- and the priest gave a curious tap, which Cuthbert repeated by imitation; "and when thou art admitted, ask for Robert Catesby, and give him the packet.