The Jigsaw Man by Richard Matheson

In a chilling exploration of identity and survival, the narrative unfolds in a dystopian future where society has adopted a radical approach to crime and punishment. The protagonist, a man convicted of a minor offense, finds himself subjected to a horrifying procedure where his body parts are systematically replaced with those of other criminals. As he grapples with the loss of his physical self and the psychological torment of becoming a patchwork of humanity, he embarks on a desperate quest to reclaim his identity and challenge the oppressive system that seeks to dehumanize him.