In his Introduction, Meyer's Watson declares that "The Lion's Mane", "The Mazarin Stone", "The Creeping Man" and "The Three Gables" (all Arthur Conan Doyle-written adventures from 1927's "The Case-Book of Sherlock Holmes") are forged "drivel". "The Creeping Man" has been accused of resembling a science-fiction tale more than a Holmes adventure, "The Mazarin Stone" is often viewed as an awkward adaptation of a theatrical script by Doyle and some have objected to a racist characterization in "The Three Gables". "The Lion's Mane", while perhaps less controversial than the other tales, is notable for being one of the canon's two stories narrated by Holmes. Meyer's Watson also states that other forgeries exist, though whether canonical works are concerned is not specified.