"Tantric yoga and the wisdom goddesses" ia an excellent book introducing the essence of hindu tantrism. the book discusses all the major concepts and offers valuable corrections for many existing misconceptions.
It also introduces the reader to the core tantric practices of meditation and mantra recitation, focusing on the 10 wisdom goddesses[dasa mahavidya].
This book presents the meditational and mantric side of tantra which is the more common side of tantra practiced in India.
It is written from the standpoint of a practitioner and also from one trained in Ayurveda.
It tries to present the living spirit and practice of tantra, rather than just another academic view.
The book is divided into three primary sections, with the fourth as an appendix.