This large book on yoga and kriya shows in detail how to do various yoga exercises, breathing excercises, a meditation method called ajapa japa, kriya yoga, and very much else.
It does not seek to indoctrinate anyone, but to present an Indian-based, yogic lifestyle with its claims and demands on your time.
And contrary to other books that sell by their title of "kriya yoga", this one gives you exact kriya methods, in a progressive program. It shows up from the book that there are many kriya yoga techniques, but also a core kriya method: it is a way of breathing that is called ujjayi.
There are others that propagate kriya yoga too, but some tie you for it, tie you to beliefs, guru worship, and tie your future by a harsh oath of unconditional loyalty that purports to extend even for life-times. Self-Realization Fellowship hands out kriya yoga in such a way. If you value the freedom you have got already, here is a better deal - kriya without ties.
The programs in the book are strenuous, but should be attainable by quite supple persons, all in all.
I am glad indeed I got this large (over 950 pages) repository of yoga teachings and methods, and thankful to the publishers too. It is a book I would not miss.