An internal succession war within House Targaryen at the height of its power, 172 years before the birth of Daenerys Targaryen.

Armed with only the word "Tenet," and fighting for the survival of the entire world, CIA operative, The Protagonist, journeys through a twilight world of international espionage on a global mission that unfolds beyond real time.

A computer engineer investigates the secretive development division in her company, which she believes is behind the disappearance of her boyfriend.