Worlds of the Imperium

"Worlds of the Imperium" by Keith Laumer is a science fiction book that tells the story of Brion Bayard, who is pulled into an alternate reality and learns he has a double who is a powerful and evil leader. Brion gets a mission to take his double's place and stop him, but he struggles with what's right and wrong as he learns more about this new world. The story starts with Brion in a strange version of Stockholm, realizing someone is watching him. Soon, he's taken away and meets Captain Winter, who tells him about other realities and why Brion is important. Brion must make a big decision that changes everything, putting him in a tricky game of politics and forcing him to question who he is and what he believes in as he navigates this universe.