Ronaldo: The Obsession for Perfection is a biography of Portuguese football superstar Cristiano Ronaldo, tracing his rise from his early years and Sporting CP through Manchester United and his record-breaking move to Real Madrid. Luca Caioli examines the qualities, ambition and relentless work ethic that helped Ronaldo become one of the defining footballers of his generation.

The book draws on interviews and insights from people around Ronaldo, including coaches, teammates and others close to his career. Several updated editions extend the story as Ronaldo's career developed, covering his achievements with Real Madrid and Portugal.