The Rozabel Line is another book which is about the life and death of Jesus Christ combined with fiction. I guess this kind of historical fiction was started by Dan Brown in Da Vinci Code wherein he has traced the bloodline of Jesus Christ.
Ashwin has done a good amount of research and there are about 209 references given at the back of the book. Most of the book quotes various historical timeframes and what happened then based on the latest research. The actual amount of fiction is quite less and is loosely knitted around the research material.
I like this book for the historical information and research references rather than the actual plot. Also the switching of context from history to fiction was quite random.
Overall the research done by author impresses me, but perhaps this book lacks a strong plot and good editing.