Demon in the Mist - Part 4: The Depths of Hell - This is book 4, the final part, of the merge series #771602

This is about the future mage Jonathan Tanner Thomas who is caught up in the merging of the two realms – magic and science. The two, a long time ago, had been separated for being the same thing in different forms. They were never meant to be together and the rejoining of them nearly destroys the earth realm as well as all the others. The merge is made to occur so the demon king can take control of the realms. Jon Tom, who never wants to be a hero, is the only one who can stop it.