This book investigates the evolution and eventual decline of the British documentary film movement from its inception through the mid-20th century. Drawing on extensive archival research and interviews, Elizabeth Sussex, a historian specializing in film, presents a comprehensive analysis of the key figures, influential films, and shifting socio-political contexts that shaped this significant cinematic tradition. The work argues that while the movement achieved considerable artistic and social impact, its eventual fragmentation was a result of internal ideological disputes and changing funding landscapes.

This work is recognized as a foundational text in the study of British documentary film, offering a detailed historical account and critical analysis. Scholars often cite Sussex's meticulous research and comprehensive scope in understanding the movement's trajectory. The book is valued for its balanced perspective, acknowledging both the achievements and the eventual challenges faced by the documentary filmmakers.