Read "The Case of the Lever Key" by Arthur Morrison online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
We learned late on the following day that Henning had not appeared at the office. From that we assumed that he must have met his confederate in the evening, and, finding that he had not received the message sent, conceived that something was wrong, and made himself safe. The confederate, Hunt, however, made his appearance early next morning, but escaped.
What happened is best told in Plummer's words when he called on Hewitt in the afternoon.