The Prisoner of the Devil is a Sherlock Holmes pastiche novel by Michael Hardwick, originally published in 1979.

[1] The acclaimed novel[2][3] features Holmes called in to solve the case of the Dreyfus affair.

[4][5][6] The book has since been republished in 1990 by Pinnacle Books[7] and in 2018 by MeanTime Books.

[8] Michael Dirda reviewed the book for the Detroit Times and found himself "lukewarm" towards it.

[9] Publishers Weekly claimed the book was " enthusiastically endorsed by both the Baker Street Irregulars and the Conan Doyle estate.