This chapter considers Stevenson’s acknowledged collaborations with his wife, Fanny, most substantially, their co-written work, The Dynamiter, also titled More New Arabian Nights (1885). Husband and wife collaborations create subtle problems, largely because we expect a wife to assist her husband without credit. The Dynamiter structurally draws upon The Thousand and One Nights, which themselves concern issues of narrative and marriage. The Dynamiter, a novel about Irish terrorism, was well regarded in the nineteenth century, but not so in the twentieth or twenty-first, precisely because recent critics have resented Fanny’s involvement. The chapter additionally considers Fanny and Louis’ collaborative play “The Hanging Judge” and the controversy surrounding Fanny’s short story “The Nixie.”