In 1949, a fourteen-year-old boy in Maryland began speaking in tongues, levitating, and exhibiting violent behavior that no doctor could explain. His family called a priest. What followed became the most documented case of exorcism in American history — and the direct inspiration for *The Exorcist*. Thomas B. Allen reconstructs the actual events with meticulous research: psychiatric records, diary entries from attending priests, interviews with witnesses. This isn't Hollywood. It's stranger, more disturbing, and deeply unsettling because it happened. Allen, a military historian, approaches the case with journalistic rigor, presenting the facts without sensationalism while letting readers draw their own conclusions about what possessed that boy. For anyone who thought *The Exorcist* was terrifying fiction — this is the real story behind it.
