“Not at all. They know all they see at Godolphin Street. They know⁠—and shall know⁠—nothing of Whitehall Terrace. Only we know of both events, and can trace the relation between them. There is one obvious point which would, in any case, have turned my suspicions against Lucas. Godolphin Street, Westminster, is only a few minutes’ walk from Whitehall Terrace. The other secret agents whom I have named live in the extreme West End. It was easier, therefore, for Lucas than for the others to establish a connection or receive a message from the European Secretary’s household⁠—a small thing, and yet where events are compressed into a few hours it may prove essential. Halloa! what have we here?”

Mrs. Hudson had appeared with a lady’s card upon her salver. Holmes glanced at it, raised his eyebrows, and handed it over to me.

“Ask Lady Hilda Trelawney Hope if she will be kind enough to step up,” said he.