"That will not be necessary, thank you," Daniel returned politely. "John Doe let us know that he was only one of several Hoisters, Dubbers, and Mill-Layers—these are different specialties under the broad heading of House-Breakers—who took it upon themselves to respond to an Opportunity bruited about the Tatler-Lock and other such kens by a personage whose identity was not announced but who was suspected to be Jack the Coiner. This personage let it be known he was interested in certain buildings—specifically for what might be concealed in the walls of those buildings. Anyone who entered a building on the list, and extracted aught from its walls, was to take it to the Tatler-Lock and give the personage an opportunity to buy it. He is only interested in certain items, not others—so each must be carefully appraised before ’twill be paid for."