What is the tone in the nonfiction book, The Harbinger: The Ancient Mystery That Holds the Secret of America’s Future?

The tone of this novel tends to be informative but a bit preachy. The reason for this is that it is written as a warning to Americans to return to God's ways in order to avoid judgment. The frame story regarding Nouriel and Ana prevents the novel from becoming too preachy despite the intensity of its message as it serves to admit that the message seems bizarre and unrealistic while simultaneously confirming the accuracy of the prophet's claims. By doing this, the author allows the reader to identify with these characters as they overcome their own skepticism. Both Nouriel and Ana begin as skeptics when they first hear of the mystery of the Nine Harbingers, but their faith increases as they are provided with more proof of the accuracy of these claims, and this serves to present and dispute any arguments that the reader may have.