The novel is now narrated by a woman named Miss Clack. Miss Clack lives alone in London; she is related to the late Sir John Verinder (Rachel’s father). Like Betteredge, Miss Clack has been asked by Franklin Blake to write down everything she remembers about the period when the diamond was stolen. She begins her narrative describing how she was passing by the London house owned by Lady Verinder on July 3, 1848. At this time, Rachel and Lady Verinder have come to London after dismissing Cuff from the case, picking up the narrative where Betteredge left off. Miss Clack notices that Rachel and Lady Verinder have come to London, and arranges to have lunch with them.

Miss Clack is very religious and supports local charities; the night before her planned lunch with Lady Verinder, she goes to a meeting of a charitable society that Godfrey Ablewhite is also involved with. At the meeting, Miss Clack learns of an unusual event that has befallen Godfrey. Godfrey was lured to a strange room on the premise that someone wanted to donate money to one of his charities, but when he got there, he was attacked, blindfolded, and searched, although nothing was stolen from him.