Inferno is based on Dante's The Divine Comedy, which is broken into three parts Paradise, Purgatory and Hell. I don't want to give away too much information, but to be honest, I'm 100 pages in and have just seen the tip of the iceberg. I'm wondering if there will be some sort of threat of global biological warfare, which somehow relates to Dante's Inferno. I admit, there are still a lot of pieces to put together in the next 350 pages. I'll be sure to update you once I complete it.