"Vaishnav Sadhu ki Rahani" is a spiritual book published by Shri Harinam Press, Vrindavan. The book is written in Hindi and is a collection of biographies of Vaishnav saints who have made significant contributions to the Vaishnav tradition. The book provides insights into the lives and teachings of these saints and their spiritual practices. It is a must-read for anyone interested in the study of Vaishnavism and the lives of its great saints.