The hidden prejudice is sanism. Other prejudices like racism, sexism, ageism, anti-Semitism, etc., are no longer hidden. It is the task of Michael Perlin in this book to expose sanism (again). The book is both scholarly and passionate, as befits a long-time writer, educator, and polemicist. Perlin is a professor at New York Law School and has served as director of public advocacy in New Jersey. He is the winner of the Manfred Guttmacher award for his book The Jurisprudence of the Insanity Defense(1), which I had the opportunity to review for the Journal(2).