This book does some work explaining and elaborating on the 18 mantras of Sri Isopanisad. He takes a look at where we stand as flawed physical sentient beings within the cycles of repeated death and birth, plus how to break away from that, the material plane, and the law of Karma. He says that the only solution to our problems is a God-centered life, and spiritual knowledge, as opposed to material- which leads to 'nescience.' Summed up, this book is about uniting with God, through the guide of a teacher, and ending the painful process of rebirth.
The book has some nice images as well, and while reading I was entranced into the painting of the stages of birth and death. Also, if the ideas of this book is where you want to take your life, then there is also a final section on Krishna Consciousness at Home.