Exiles at the Well of Souls

When Antor Trellig, the head of a ruthless interstellar syndicate, seizes control of a supercomputer with godlike powers, the Council forces master criminal Mavra Chang into undertaking a mission to stop Trellig, but suddenly she and Trellig find themselves drawn across the universe to a mysterious planet and placed into alien bodies caught in the middle of an epic battle for control of the universe itself. Reprint.