Gnomon

"In the world of Gnomon, citizens are ceaselessly observed and democracy has reached a pinnacle of "transparency." When suspected dissident Diana Hunter dies in government custody during a routine interrogation, Mielikki Neith, a trusted state inspector, is assigned to the case. Immersing herself in neural recordings of the interrogation, she finds a panorama of characters and events that Hunter gave life to in order to forestall the investigation: a lovelorn financier in Athens who has a mystical experience with a shark; a brilliant alchemist in ancient Carthage confronting the unexpected outcome of her invention; an expat Ethiopian painter in London designing a controversial new video game. In the static between these mysterious visions, Neith begins to catch glimpses of the real Diana Hunter--and, alarmingly, of herself, the staggering consequences of which will reverberate throughout the world."--

Synopsis from Open Library.