As Regan’s condition worsens, Chris turns to a Catholic priest, Father Damien Karras, who is struggling with his own faith. Karras is paired with an older priest, Father Lankester Merrin, who has experience with exorcisms. Together, they attempt to perform an exorcism on Regan, but the ritual is complicated by the demon’s incredible power and cunning.
The novel has also been influential in the horror genre, inspiring countless other writers and filmmakers. The idea of demonic possession has become a staple of horror fiction, and El Exorcista is often cited as one of the key works that helped to popularize the concept.
One of the key themes of El Exorcista is the struggle between good and evil. The novel explores the idea that evil is a real and powerful force that can take many forms, including demonic possession. The character of Regan is a symbol of innocence and purity, and her possession by a demon serves as a metaphor for the corruption of innocence.