This book is the English translation of Isavasya Upanishad by Swami Sarvananda, a disciple of Swami Brahmananda and a Vice-President of Ramakrishna Order. It contains the original mantras, transliteration, word by word meaning and overall English translation, with useful notes. The Introduction and Appendix have invaluable explanations and interpretations of the translator on the Upanishad.