Magic by William Goldman

A struggling ventriloquist revives his career when he reconnects with his charismatic but malevolent dummy, Fats; as success grows his grip on reality loosens and the line between man and puppet dissolves, unleashing jealousy, violence and a chilling unraveling of identity and trust. Told with dark humor and mounting dread, the story probes the costs of showmanship and the terrifying possibility that the puppet has a will of its own.

Purchase from Bookshop.org