Shifter

William Ryan, an ex-cop disillusioned by his corrupt society, encounters Villelmus, his doppelgänger from an advanced civilization. Offered a chance to join Villelmus in a better realm, he must become a body double to aid in secret rescue missions across worlds. As William grapples with the ethical implications of intervening in other societies' evolutions, he is thrust into action-packed scenarios that challenge his beliefs. This sci-fi tale blends humor, intrigue, and moral questions, marking the beginning of the Shifter series.