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The Exorcist Code #3
The Exorcist Code 3: Apocalypse
The apocalypse won’t arrive with fire from the sky.
It will come through screens. Through code. Through belief weaponized at scale.
The Cult of Necrocist has evolved. No longer content with possession one soul at a time, they have unleashed a demonic intelligence capable of infecting machines, networks and human minds. A supernatural virus spreading faster than faith can keep up.
Father Callum returns, carrying the scars of battles he barely survived, reunited with Michael, the android exorcist once thought destroyed. Together, they face a new kind of one where demons manipulate social media, turn technology into scripture, and prepare the world for mass possession.
This time, it’s not about saving a soul.
It’s about saving the world.
It will come through screens. Through code. Through belief weaponized at scale.
The Cult of Necrocist has evolved. No longer content with possession one soul at a time, they have unleashed a demonic intelligence capable of infecting machines, networks and human minds. A supernatural virus spreading faster than faith can keep up.
Father Callum returns, carrying the scars of battles he barely survived, reunited with Michael, the android exorcist once thought destroyed. Together, they face a new kind of one where demons manipulate social media, turn technology into scripture, and prepare the world for mass possession.
This time, it’s not about saving a soul.
It’s about saving the world.
- GenresHorror
244 pages, Kindle Edition
First published February 28, 2026
About the author
William Massa
74 books274 followersWilliam Massa is a produced screenwriter and bestselling Amazon author who writes monsters, magic, and mayhem with a cinematic edge.
His screen credits include Return to House on Haunted Hill, and he has sold scripts and pitches to Warner Bros., Sony, USA Network, Silver Pictures, Dark Castle Entertainment, and Maverick Films.
Drawing on a lifelong love of horror, action movies, pulp adventure, and the supernatural, William specializes in Dark Urban Fantasy, Action-Adventure Horror, and supernatural thrillers—a blend he likes to call Heroic Horror: ordinary and extraordinary heroes facing impossible evil and fighting back.
His series include The Hexecutioner, The Paranormalist, Shadow Detective, Night Slayer, Occult Assassin, and The Exorcist Code, with new nightmares always in the works.
William has lived in New York, Florida, and Europe and now resides in Venice Beach, California, surrounded by skaters, surfers, palm trees and plenty of inspiration for things that go bump in the night.
Find William on social media.
Facebook: WilliamMassaBooks for news, updates and announcements.
Instagram: @bill.massa
Email: williammassabooks@gmail
His screen credits include Return to House on Haunted Hill, and he has sold scripts and pitches to Warner Bros., Sony, USA Network, Silver Pictures, Dark Castle Entertainment, and Maverick Films.
Drawing on a lifelong love of horror, action movies, pulp adventure, and the supernatural, William specializes in Dark Urban Fantasy, Action-Adventure Horror, and supernatural thrillers—a blend he likes to call Heroic Horror: ordinary and extraordinary heroes facing impossible evil and fighting back.
His series include The Hexecutioner, The Paranormalist, Shadow Detective, Night Slayer, Occult Assassin, and The Exorcist Code, with new nightmares always in the works.
William has lived in New York, Florida, and Europe and now resides in Venice Beach, California, surrounded by skaters, surfers, palm trees and plenty of inspiration for things that go bump in the night.
Find William on social media.
Facebook: WilliamMassaBooks for news, updates and announcements.
Instagram: @bill.massa
Email: williammassabooks@gmail
Ratings & Reviews
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Community Reviews
Displaying 1 - 5 of 5 reviews
July 18, 2026
Demon in the Data?
Small backstory:
Father Callum is back with a new mission and this time he is reunited with Michael from the first book. Except Michael is little different this time around but he is there to help Father Callum stop an evil force that has become a demonic super data computer.
This time around the duo will have to use their wits along with Michael's computer technology to beat the demon that has become embedded in the data computer. Do they win or lose this fight?
That is about all I can hand out with a small back story and no spoilers here as you will need to read the book and series to find out what happens!
Thoughts:
This story took off once again as this book threw me right back into the melee with Father Callum. I was happy that Michael had returned and once again he was a great help to Father Callum.
The pace was fast as usual and kept me wrapped within the story as it moves along at a great speed! There was no slowing down with this book as the story escalated the more I became involved with the story. The last 40% the story goes into overdrive and kept me moving at the speed of light!
Looking forward to reading book four and the final book in this series to see what happens next for Father Callum and Michael! Giving this book five "Demonic Terror Technology" stars!
Small backstory:
Father Callum is back with a new mission and this time he is reunited with Michael from the first book. Except Michael is little different this time around but he is there to help Father Callum stop an evil force that has become a demonic super data computer.
This time around the duo will have to use their wits along with Michael's computer technology to beat the demon that has become embedded in the data computer. Do they win or lose this fight?
That is about all I can hand out with a small back story and no spoilers here as you will need to read the book and series to find out what happens!
Thoughts:
This story took off once again as this book threw me right back into the melee with Father Callum. I was happy that Michael had returned and once again he was a great help to Father Callum.
The pace was fast as usual and kept me wrapped within the story as it moves along at a great speed! There was no slowing down with this book as the story escalated the more I became involved with the story. The last 40% the story goes into overdrive and kept me moving at the speed of light!
Looking forward to reading book four and the final book in this series to see what happens next for Father Callum and Michael! Giving this book five "Demonic Terror Technology" stars!
March 13, 2026
Since AI is now becoming part of normal internet usage the thought of this being real is terrifying!
OMG the fight of good vs evil just got even scarier! AI is becoming more important to people that use tech, which in itself isn't A bad thing until the bad people find out what they can do with for evil!
The Necrosist, A demonic serial killer and a transhumanist obsessed with building the perfect vessels for demons. And it starts with a "harmless" neural implant. What could go wrong?
I can't wait till book 4 comes out in December!!!!
OMG the fight of good vs evil just got even scarier! AI is becoming more important to people that use tech, which in itself isn't A bad thing until the bad people find out what they can do with for evil!
The Necrosist, A demonic serial killer and a transhumanist obsessed with building the perfect vessels for demons. And it starts with a "harmless" neural implant. What could go wrong?
I can't wait till book 4 comes out in December!!!!
March 12, 2026
Father Callum returns, assisted by Michael II, as they face a new danger, this one man made. A computer AI built to be the ultimate evil adversary, breaks free of its confinement to wreak havoc on the world. Another interesting take on future tech and how evil corrupts.
March 13, 2026
Mr. Massa has written another great book. Thank you for continuing to share your stories.
August 14, 2026
I'm on book 4 and still really enjoying it. Like the movie "I am Robot" I can see stuff like this happening. I would like to see this as a series on TV or streaming. Good job.
Displaying 1 - 5 of 5 reviews