This book is the philosophical interpretation of Indian classical book of Vedic wisdom, which teaches dharma - religious path, more commonly known as bhakti-yoga - path of devotional service to The Lord.
Only 11 chapters (of 18) are ready at the present moment, but you can access them for free, before this book will become complete.
Certain parts of the book are extended, while other parts are condensed - for better meditation, introspection and insight.
There are many editions of Bhagavd-Gita, but most of them are written by non-devotees, and try to "kill" Krishna, speaker of Bhagavad-Gita, to make Him impersonal spirit (brahmajyoti - rays of Brahman), which is a great offence, sin. This book is free from such dangerous interpretations, so it is safe for your spiritual health.
Hope, you'll like this book.