The Siddhargal Rajyam by Indra Soundarrajan is about the life of Siddhars. The book delves into the famous Siddhars and is a type of biographical book that makes you want to read more about them. The Siddhars were highly intelligent people who achieved Siddhi. They had great wisdom and knowledge in a wide range of subjects. This book is like a window that helps you see what they were about and is like an introductory book. Order from Giri UK.