17 Richmond Street

17 Richmond Street is the address of the office of Mr Parker Pyne. This is the only contact detail featured in his newspaper advertisements asking people who are unhappy to get in touch with him. Miss Lemon, his secretary, works in the outer office. From The Case of the Discontented Soldier, it appears that Ariadne Oliver, also a member of Parker Pyne's staff, has an office in the same house, up two flights of steps from Parker Pyne's office.