If you DON'T care for books in which....1. ...the characters are very stereotypical;2. ...the authors take great liberties with the thoughts, words, and actions of actual historical figures and make them say and do things that you know they never did, or would have done;3. ...the main characters are great pals with the actual historical figures, and are rich, are beautiful, are witty- in short, have absolutely everything they need to accomplish the story and aren't very believable;4. ...the plot isn't believable;Then, these books might not be just right for you.
Yes, the books are very interesting. The plots aren't very believable, but they are interesting. The history contained in them is written well, and the books are worth reading for that alone. Unfortunately, these books are more of the same historical fiction in which overall unbelievability prevails, and that spoiled the books for me. Now, if you are not picky about having great people in history meddled with (for example, at one point in the third book Winston Churchill gets involved in a plot to kidnap the heroine, because she would be so exceedingly valuable as a spy for the Allies), and you don't worry about the other points in my list either, then you probably will like the books. For reading for amusement, they are fine. But if you want really great historical fiction, I wouldn't suggest the Zion Covenant.