The Tripura Rahasya occupies a distinctive position in the Indian nondual canon. Where the classical Advaita texts insist on a strictly impersonal Self, the Tripura Rahasya allows the recognition of nonduality to be approached through the goddess Tripura, the threefold reality that is both the world and what underlies it.
The text is structured as a sustained dialogue between Parashurama, the avatar warrior, and his guru Dattatreya. The frame is the story of Hemachuda, a young king whose awakening unfolds gradually under the instruction of his wife Hemalekha, who turns out to be already realised. The story moves through the standard concerns of Vedanta — the nature of the Self, the unreality of the apparent world, the means of liberation — but does so through narrative rather than direct exposition.
[ A representative passage. The complete text unfolds the dialogue between Parashurama and Dattatreya across twenty-two chapters and roughly two hundred pages. The full Venkataramiah translation is at the source linked above. ]