On that warm morning in July the door to an intricate and singular house creaked invitingly ajar. I who considered myself so wise and sceptical was then to proceed in ignorance along its dark arteries, stumbling through blind passages and secret chambers in which, these many years later, I still find myself searching in vain for a clue. It is easier to find a labyrinth, writes Comenius, than a guiding path. Yet every labyrinth is a circle that begins where it ends, as Boethius tells us, and ends where it begins. So it is that I must double back, retrace my false turns and, by unspooling this thread of words behind me, arrive once again at the place where, for me, the story of Sir Ambrose Plessington began.

The event to which I refer took place on a Tuesday morning in the first week of July. I well remember the date, for it was only a short time after King Charles II had returned from his exile in France to take the throne left empty when his father was beheaded by Cromwell and his cronies eleven years earlier. The day began like any other. I unbarred my wooden shutters, lowered my green awning into a soft breeze, and sent Tom Monk to the General Letter Office in Clock Lane. It was Monk's duty each morning to carry out the ashes from the grate, brush the floors, empty the chamber-pots, cleanse the sink and fetch the coal. But before he performed any of these tasks I sent him into Dowgate to call for my letters. I was most particular about my post, especially on Tuesdays, which was when the mail-bag from Paris arrived by packet-boat. When he finally returned, having dallied, as usual, along Thames Street on the way back, a copy of Shelton's translation of Don Quixote, the 1652 edition, was propped on my paunch. I looked up from the page and, adjusting my spectacles, squinted at the shape in the doorway. No spectacle-maker has ever been able to grind a pair of lenses thick enough to remedy my squinch-eyed stare. I marked my place with a forefinger and yawned.