What is the author's tone in Beneath a Marble Sky: A Novel of the Taj Mahal by John Shors?

The majority of the story is told in the real-time narration. We get a tone of realism and subjectivity. Readers are privy to Jahanara's thoughts only, though there is a mix of exposition, dialog, and inner monologue throughout the novel. The author uses the frame story to establish the reliability of his narrator.