"Certainly, sir," assented Krevin. "St. Lawrence Lane is a narrow thoroughfare, about eighty to ninety yards in length which lies at the back of Mr. Mallett's house--I mean the bank premises--the Moot Hall, and Dr. Wellesley's house. It's north entrance, at the corner of the bank, is in Woolmarket; its south in Strand Lane. On its west side there is a back door to the bank house; another into Bunning's rooms on the basement of the Moot Hall; a third into the Police Office, also in that basement; a fourth into the rear of Dr. Wellesley's house. On the opposite side of the lane--the east--there is nothing but St. Lawrence's Church and churchyard. St. Lawrence's church tower and west end faces the back of the Moot Hall; there is a part of the churchyard opposite the bank premises--the rear premises; the rest of the churchyard faces Dr. Wellesley's house--the back of it, of course." "Is the lane much frequented?" "No, sir; it is very little used. Except by tradesmen going to Mr. Mallett's or to Dr. Wellesley's back doors, and by people going to the Police Office, it is scarcely used at all. There is no traffic along it. On Sundays, of course, it is used by people going to the services at St. Lawrence." "Would it be likely to be quiet, unfrequented, of an evening?" "Emphatically--yes." "Do you think it likely that any person wishing to enter the Moot Hall unobserved and seeing Mrs. Bunning go away from her rooms and round the corner to the _Chancellor_ Vaults--as we've just heard she did--could slip in unseen?" "Oh, to be sure!" affirmed Krevin. "The easiest thing in the world! If I may suggest something----?" "Go on, go on!" said the Coroner, waving his spectacles. "Anything that helps--suggest whatever you like." "Well," said Krevin, slowly and thoughtfully, "if I may put it in my own way. Suppose that there is somebody in the town who is desirous of finding the late Mayor alone in the Mayor's Parlour, being also cognizant of the fact--well known to many people--that the late Mr. Wallingford was to be found there every evening? Suppose, too, that that person was well acquainted with the geography of St. Lawrence Lane and the Moot Hall? Suppose further that he or she was also familiar with the fact that Mrs. Bunning invariably went out every evening to fetch the supper beer from the _Chancellor_ Vaults? Such a person could easily enter the Bunnings' back door with an absolutely minimum risk of detection. The churchyard of St. Lawrence is edged with thick shrubs and trees, anybody could easily hide amongst the shrub--laurel, myrtle, ivy--watch for Mrs. Bunning's going out, and, when she had gone, slip across the lane--a very narrow one!--and enter the door which, as she says, she left open. It would not take two minutes for any person who knew the place to pass from St. Lawrence Churchyard to the Mayor's Parlour, or from the Mayor's Parlour to St. Lawrence Churchyard."