‘Three Crucial Decades: Studies in the Book of Acts’ by Floyd V. Filson is a book that presents a positive evaluation of the historical data and theological issues found in the Book of Acts, which chronicles the rise and expansion of the early Christian church during its first thirty years (roughly A.D. 31 to 62). Filson provides a positive argument for the historical reliability of Luke's account, examining geographical details, titles of officials, and the chronology of events as they correlate with external sources. In essence, the book is a study of how the early church, through the guidance of the Holy Spirit, rapidly expanded its reach and influence across the Roman world during a pivotal era in history. The book's main theme focuses on how a small group of people, empowered by the Holy Spirit, spread the Gospel from Jerusalem to the wider Roman Empire, effectively ‘turning the world upside down’ (Acts 17:6).