Seminary student Michael Kovak reluctantly attends exorcism school at the Vatican. While he’s in Rome, Michael meets an unorthodox priest who introduces him to the darker side of his faith, uncovering the devil’s reach even to one of the holiest places on Earth.

When a humorous script-reader in her New York apartment sees an ad in the Saturday Review of Literature for a bookstore in London that does mail order, she begins a very special correspondence and friendship with Frank Doel, the bookseller who works at Marks & Co., 84 Charing Cross Road.