This book is a compendium of the work on Tantra, Mantra and Yantra. This book is purely based on Old Sanskrit classics. In this book the authors have tried to associate the mantra shastra with astrology. In addition to this, some of the problems of the devotees have been addressed in the work on mantra sadhana. It deals with mantras for worship, sadhana, appeasing of deities, will power, concentration and many other aspects on mantra sadhana.