Eco, an Italian philosopher and best-selling novelist, is a great polymathic fabulist in the tradition of Swift, Voltaire, Joyce, and Borges. The Name of the Rose, which sold 50 million copies worldwide, is an experimental medieval whodunit set in a monastic library. In 1327, Brother William of Baskerville arrives to investigate heresy among the monks in an Italian abbey; a series of bizarre murders overshadows the mission. Within the mystery is a tale of books, librarians, patrons, censorship, and the search for truth in a period of tension between the Papacy and the Holy Roman Empire. The book became a hit despite some obscure passages and allusions. This deftly abridged version, ably performed by Theodore Bikel, retains the genius of the original but is far more accessible. Foucault's Pendulum, Eco's second novel, is a bit irritating. The plot consists of three Milan editors who concoct a series on the occult for an unscrupulous publishing house that Eco ridicules mercilessly. The work details medieval phenomena including the Knights Templar, an ancient order with a scheme to dominate the world. Unfortunately, few listeners will make sense of this failed thriller. The Island of the Day Before is an ingenious tale that begins with a shipwreck in 1643. Roberta della Griva survives and boards another ship only to find himself trapped. Flashbacks give us Renaissance battles, the French court, spies, intriguing love affairs, and the attempt to solve the problem of longitude. It's a world of metaphors and paradoxes created by an entertaining scholar. Tim Curry, who also narrates Foucault's Pendulum, provides a spirited narration. Ultimately, libraries should avoid Foucault's Pendulum, but educated patrons will form an eager audience for both The Name of the Rose and The Island of the Day Before.-James Dudley, Copiague, N.Y.