The book is a comprehensive treatise on the subject of 'siddha yoga'. it throws light on the much famous subject of 'kundalini' and the physiological changes accompanying the spiritual evolutionary process, in the backdrop of the author's personal experiences. the indispensability of a siddha guru is highlighted in the processes set in motion, brought home by the practical catalytic methods of 'mantra', 'yantra' and 'yajna'. the book seeks to impress that spirituality is a transformative process from the base human to ultimately the divine.