Gnomon

"In the world of Gnomon, citizens are constantly observed and democracy has reached a pinnacle of ‘transparency.’ Every action is seen, every word is recorded, and the System has access to its citizens’ thoughts and memories–all in the name of providing the safest society in history.

When suspected dissident Diana Hunter dies in government custody, it marks the first time a citizen has been killed during an interrogation. The System doesn’t make mistakes, but something isn’t right about the circumstances surrounding Hunter’s death. Mielikki Neith, a trusted state inspector and a true believer in the System, is assigned to find out what went wrong."

Description source: Goodreads novel page