Heretical Fictions is the first full-length study to assess the importance of Twain’s heretical Calvinism as the foundation of his major works, bringing to light important thematic ties that connect the author’s early work to his high period and from there to his late work. Berkove and Csicsila set forth the main elements of Twain’s “countertheological” interpretation of Calvinism and analyze in detail the way it shapes five of his major books—Roughing It, The Adventures of Tom Sawyer, Adventures of Huckleberry Finn, A Connecticut Yankee in King Arthur's Court, and No. 44, The Mysterious Stranger—as well as some of his major short stories. The result is a ground-breaking and unconventional portrait of a seminal figure in American letters.