The Adventure of the Cheerful Four both the puppets of Jonathan Small and Arthur Morstan have the atmosphere of the members of a famous British musical band. One night Arthur Morstan, a pupil of Archer House is attacked and gets injured. His younger sister Mary Morstan requests Sherlock Holmes to solve why his brother is attacked while John H. Watson falls in love with her. They began searching Arthur's room with the help of Abdullah, roommate of Arthur. Holmes suspects that the offeder stole into the room from skylight and he and Mary find small handprints around it on the roof. Watson tries to get up
The Sign of the Four miscommunication led Tonga to kill Bartholomew as well. Mary Morstan is left without the bulk of the Agra treasure, although she will apparently receive the rest of the chaplet. John Watson falls in love with Mary, and it is revealed at the end that he proposed to her and she has accepted. Sir Arthur Conan Doyle described how he was commissioned to write the story over a dinner with Joseph M. Stoddart, managing editor of an American publication "Lippincott's Monthly Magazine", at the Langham Hotel in London on 30 August 1889. Stoddart wanted to produce an English version of "Lippincott’s"