Transition by Iain M. Banks

In a universe of infinite realities, power belongs to those who can move between them. The Transitionaries — agents of a mysterious organization called The Concern — slip from world to world, altering the course of history to serve hidden masters. But when one of them begins to question his orders, the line between savior and destroyer blurs. Transition is a gripping, mind-bending novel that fuses political intrigue, moral complexity, and speculative brilliance, reaffirming Iain M. Banks as one of modern fiction’s most daring storytellers.