Geeta Rahasya is the analysis of Karmayoga in the Bhagavad Gita, which is known to be gift of the Vedas and the Upanishads. It includes an external examination of the Gita, the original stanzas, their Gujarati translation, commentaries on the stanzas, and a comparison of Eastern with Western doctrines etc.
The book is originally written by Lokmanya Bal Gangadhar Tilak.