All his life, Giovanni Bernini has possessed an uncanny gift: he can imitate anyone he meets. Honed by his mother at a young age, the talent catapults him from small-town obscurity to stardom. As Giovanni describes it, 'No one's disguise is perfect. There is in every person, no matter how graceful, a seam, a thread curling out of them . . . When pulled by the right hands, it will unravel the person entire. 'As his fame grows, Giovanni encounters a...