A bloke wanting to leave the urban confines of Clerkenwell Green and venture out across the fields toward Black Mary’s Hole would have to contend with a few obstacles. For directly in his path stood the ancient compound of St. James’s, and on the far side of that was a new-built prison, and just beyond that, a bridewell run by Quakers. And the sort of bloke who passed the time of day going up to Black Mary’s Hole would instinctively avoid such establishments. So he would begin his journey by dodging westwards and exiting Clerkenwell Green through a sort of sphincter that led into Turnmill Street. To the left, or London-wards, Turnmill led into the livestock markets of Smithfield, and was lined with shambles, tallow-chandleries, and knackers’ yards: hardly a tempting place for a stroll. To the right, or leading out to open country, it forked into two ways: on the right, Rag Street, and on the left, Hockley-in-the-Hole, which presumably got its name from the fact that it had come into being along a bend of the Fleet, which there had been bridged in so many places that it was vanishing from human ken.