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Vatican Secret Archive Books in Order

Part ofGary McAvoy Books in Order

See the Vatican Secret Archive books by Gary McAvoy in order, with short summaries, series background, and clear guidance on where to begin.

Last updated: June 8, 2026

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Publication Order

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12 books

1

The Vivaldi Cipher

by Gary McAvoy

2021

A message hidden in Vivaldi's music leads Father Michael Dominic to Venice and a centuries-old art forgery ring tied to the Vatican. With Hana Sinclair and a music cryptologist beside him, he races the Camorra to crack the code first.

2

The Avignon Affair

by Gary McAvoy

2022

After a body and hidden parchments are found beneath Notre-Dame, Father Michael Dominic is drawn into a French political crisis and a hunt for secrets buried since the Avignon papacy. The case quickly becomes bigger than archaeology or Church history alone.

3

The Opus Dictum

by Gary McAvoy

2022

A lost briefcase tied to banker Roberto Calvi surfaces in the Vatican Archives, pulling Father Michael Dominic into a fight over blackmail files, secret societies, and a looming papal conclave. The deeper he digs, the more dangerous the conspiracy becomes.

4

The Petrus Prophecy

by Gary McAvoy

2022

After a Jesuit scholar dies, Father Michael Dominic helps investigate a missing manuscript about prophecy and the Third Secret of Fatima. As dire predictions seem to come true, the case widens into a race across Europe and the Middle East.

5

The Confessions of Pope Joan

by Gary McAvoy

2023

A cryptic diary and a lost gospel send Father Michael Dominic and Hana Sinclair into a murder case in England and a battle over the legend of Pope Joan. Their search forces buried Church history into the open.

6

The Galileo Gambit

by Gary McAvoy

2023

Father Michael Dominic escorts Galileo's original trial papers to Chicago for a modern mock trial, then priceless exhibits disappear. What starts as a scholarly event becomes a theft case tangled with Vatican politics and rival agendas.

7

The Jerusalem Scrolls

by Gary McAvoy

2023

Two boys find ancient scrolls near Qumran, including one that could upend Christian history. Father Michael Dominic races from Jerusalem to Cairo to keep the discovery away from sects, brokers, and opportunists who want it for themselves.

8

The Apostle Conspiracy

by Gary McAvoy

2024

Clues hidden around Saint Peter's bones lead Father Michael Dominic and archaeologist Marcus Russo toward a forgotten figure in early Church history. Their search draws the attention of a man who sees holy relics as a route to power.

9

The Celestial Guardian

by Gary McAvoy

2024

Father Michael Dominic uncovers a machine designed by Leonardo da Vinci that seems able to predict a catastrophic asteroid strike. Soon he is caught between scientific urgency, Vatican power struggles, and the fear that the device can do far more than predict.

10

The Hildegard Seeds

by Gary McAvoy

2025

When Hana Sinclair finds traces of a lost manuscript by Hildegard of Bingen, she and Father Michael Dominic uncover a biotech plot built on suppressing cures. The chase turns personal as history, medicine, and profit collide.

11

The Medici Heresy

by Gary McAvoy

2025

A sealed Renaissance letter sends Father Michael Dominic and Hana Sinclair into a Medici-era secret the Vatican once tried to erase. Their hunt uncovers forbidden manuscripts and dangerous questions about who gets remembered, and who gets silenced.

12

The Voynich Codex

by Gary McAvoy

2025

New fragments connected to the Voynich Manuscript pull Father Michael Dominic and Hana Sinclair into another European chase. What looks like a literary puzzle becomes a deadly fight over knowledge someone has spent centuries trying to bury.

Series background & context

If the Magdalene books open the door, the Vatican Secret Archive series is where Gary McAvoy really expands the house. Father Michael Dominic stands at the center, working from the Vatican's archive system while Hana Sinclair, Swiss Guards, scholars, detectives, and later archaeologist Marcus Russo move in and out of the action. Each novel begins with a document, relic, or historical problem that should have stayed quiet, and each one shows what happens when it doesn't.

What makes this series tick is the mix of Church bureaucracy and global motion. One chapter may be set in a guarded Vatican office, a conclave hall, or a museum vault. The next may jump to Venice during Carnivale, Jerusalem and Cairo, Paris under political strain, or Chicago during a public reexamination of Galileo. The archive is the center of gravity, but the stories never stay there.

Old knowledge is only dangerous when someone in the present knows how to use it.

The books range widely without losing the core cast. The Vivaldi Cipher turns encoded music into a trail leading to art theft and forgery. The Opus Dictum pulls Michael into blackmail, secret societies, and papal politics through the missing briefcase of Roberto Calvi. Later books tackle Fatima prophecies, hidden parchments from the Avignon papacy, scrolls from the Judean desert, Galileo's trial papers, the legend of Pope Joan, a machine designed by Leonardo da Vinci, Saint Peter's bones, Hildegard von Bingen's medical legacy, the Voynich Manuscript, and Medici-era secrets. McAvoy likes giving each entry its own historical hook.

The ongoing appeal, though, is not just the puzzle. Michael is thoughtful, stubborn, and usually in over his head with people far more ruthless than he is. Hana gives the series some needed steel, and the recurring team around them makes later books feel cumulative rather than repetitive. As the series goes on, questions of reform, legacy, institutional control, and personal loyalty become just as important as the artifact or manuscript at the center of a given case.

The tone is high-stakes historical suspense, but it is also surprisingly procedural at times. There are ciphers to solve, provenance questions to answer, security concerns to manage, and Church politics to navigate. That grounded approach is why the bigger revelations land. However wild the secret sounds at first, somebody still has to authenticate it, protect it, and decide whether the world should ever see it.

This is the most interconnected branch of the universe.

You can sample many of the books on their own, but reading in order gives the fullest picture of how the friendships, rivalries, and Vatican power struggles deepen over time. If you like thrillers built around archives, Church history, and recurring characters who carry real baggage from one case into the next, this is the series to settle into.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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All 12 Vatican Secret Archive Books in Order (2026)