The Mystical Madmen is about Spirituality, Mysticism and Existentialism present in the writings of Kahlil Gibran and Paulo Coelho. It compares the writings of Kahlil Gibran and Paulo Coelho in the eight books selected, analyses their thoughts on spirituality and existentialism and the context for their mysticism. After a brief introduction to these three concepts, it discusses Kahlil Gibran's writings and its impact of Paulo Coelho. It had been claimed by many that Coelho is a Gibran of our times. This book examines and analyses if there had been any influence on Coelho of Gibran that can entitle him to be a modern-day Gibran.