This book investigates the nature and origins of poltergeist activity through the lens of parapsychology and historical case analysis. D. Scott Rogo, a noted researcher in the field of psychical phenomena, examines whether these disturbances are manifestations of external spirits or projections of human psychic energy. The text synthesizes decades of reported cases to propose a framework for understanding how consciousness might interact with the physical environment.

Researchers in the field of parapsychology often cite this work as a comprehensive survey of mid-century ghost investigations. Readers frequently note the academic density of the prose, which balances anecdotal evidence with theoretical speculation.