Hell's Gate

Book 1 of the Multiverse series by David Weber and Linda Evans. They thought they knew how the universes worked THEY WERE WRONG! Inthe almost two centuries since the discovery of the first inter-universalportal, Arcana has explored scores of other worlds... all of them duplicates oftheir own. Multiple Earths, virgin planets with a twist, because the''explorers'' already know where to find all of their vast, untapped naturalresources. Worlds beyond worlds, effectively infinite living space and mineralwealth. And in all that time, they have never encountered another intelligentspecies. No cities, no vast empires, no civilizations, and no equivalent oftheir own dragons, gryphons, spells, and wizards. But all of that is about tochange. It seems there's intelligent life elsewhere in the multiverse. Otherhuman intelligent life, with terrifying new weapons and powers of the mind...andwizards who go by the strange title of ''scientist.''