Set fifteen years after the first film, The Exorcist III centers round the philosophical Lieutenant William F. Kinderman who's exploring a baffling series of murders around Georgetown that most contain the hallmarks of this Gemini, a deceased serial killer. It finally leads him to a patient in a psychiatric hospital who has begun to speak, detailing the murders and claiming he could be the Gemini, but bears a striking resemblance to Father Damien Karras.