World Walkers

In "World Walkers" by Neal Asher, a totalitarian regime tightens its control over Earth, but one man, Ottanger, discovers he possesses the ability to traverse alternate universes due to a mutation caused by the Inspectorate's experiments on him. As he navigates the multiverse, he encounters the Fenris, a future-evolved human who engineered the mutation to help rebels escape the oppressive Committee. Together, they must confront a looming threat that seeks to exploit their abilities, setting the stage for a battle that could reshape not just their world, but the entire multiverse.