Books like Worlds of the Imperium

When Brion Bayard was kidnapped and brought to the alternate world where Earth's history took a different turn, it was not a pleasant experience. It was, however, a startling experience. Here was a world that was just like the Earth he was taken from--with just a few subtle changes. On top of all this, Brion was given a puzzling assignment by his captors. He was to secretly enter a palace, and kill a dangerous and tyrannical dictator. There was one, small catch--the hated dictator in this world was the mirror image of Brion Bayard. For on an Alternate Earth, Brion's is his own worst enemy!