Behind the dark, glossy panelling lies a door. Step through it, and you leave behind the hall’s twisting balustrades and oil paintings to descend a short flight of dusty steps into the gloom. As the electric light clicks on, the underground passage is revealed – brick-lined, wide enough and high enough that there’s no need to cringe or creep as you move along it. This is a secret passage, but it is not secretive.
The tunnel is one of many improvements Anne Lister made to Shibden Hall when she inherited it in 1826. The 15th-century manor house stands over what she called the “old bank” from Halifax itself, set high on the side of its own valley. At one time, much of the surrounding land belonged to the Lister family.