The Case of the Tell-Tale Ribbon

When Archie answered the phone it was a Mr. Jenkins stating that he was due there an hour ago but was late because she was killed. Mr. Jenkins turned out to be just the delivery man with an important note containing five $100 bills and an invitation to spend the weekend at Mr. Mailots. However, upon arriving at the Mailots Archie was to learn that the invitation had not come from Mr. Mailot.