THE MEDICI HERESY
by Gary McAvoy
November 2 – 27, 2026 Virtual Book Tour
Synopsis:
A Vatican Secret Archive Thriller
When Father Michael Dominic uncovers a sealed Renaissance letter hidden deep within the Vatican Archives, he awakens a five-hundred-year-old secret buried by Pope Clement VII at the height of the Medici dynasty. Joined by investigative journalist Hana Sinclair, Michael follows a trail of clues through forgotten chapels, papal confessions, and ancient astronomical alignments, each step drawing them deeper into a mystery the Church once swore to silence. What begins as a scholarly puzzle quickly becomes a struggle for survival as shadowed forces—both inside and outside the Vatican—move to control or destroy what Clement left behind.
Their search reveals two extraordinary manuscripts: the Gospel of the Beloved, attributed to Mary Magdalene, and the Codex of Voices, a Renaissance record documenting the Church’s attempt to bury it forever. As Michael, Hana, and their Swiss Guard allies navigate the danger closing in around them, they confront a truth that challenges not doctrine but conscience: why some voices endure across centuries while others are violently erased. With each revelation, the line between faith and fear grows thinner, and the cost of honesty becomes terrifyingly clear.
Rich in historical detail and steeped in Vatican intrigue, The Medici Heresy weaves a modern thriller through one of the Church’s darkest chapters. From Medici Florence to the underground chambers beneath St. Peter’s Basilica, Gary McAvoy delivers a gripping tale of courage, betrayal, and redemption—where the past refuses to stay buried and the future belongs to those brave enough to face it.
While part of the Vatican Secret Archive Thrillers series, The Medici Heresy is a standalone adventure that can be enjoyed by new readers and longtime fans alike.
Praise for The Medici Heresy:
“A guilty pleasure! I’ve read all of these books in the series and love anything about Mary Magdalene. The rain became an oppressive character and seems like would have prevented them seeing the light coming through the aperture to find the hidden compartment of the sixth or so letter. I appreciate that the author distinguishes fact and fiction at the end of the book and hope he does not run out of archives to chase down.”
~ Karin
“Bravo…..again!!! You keep me captivated! I look forward to the next story in the archival series. I adore every one of your characters, good and bad. Please keep writing.”
~ Karen Veltman
“Great read! Gary McAvoy’s novels are all exciting and filled with historical references …but I truly enjoyed this novel the most—he has a way of painting pictures with words.”
~ Amazon Customer
The Medici Heresy Trailer:
Book Details:
Genre: Vatican Historical Thrillers
Published by: Literati Editions
Publication Date: November 25, 2025 | HC
Number of Pages: 394 | HC
ISBN: 9781954123786 (ISBN10: 1954123787)
Series: A Vatican Secret Archive Thriller, Book 12 || Stand Alone
Book Links: Amazon | Kindle | Barnes & Noble | BookShop.org | Goodreads | BookBub | Gary McAvoy Books
Author Bio:
Gary McAvoy is an American novelist known for internationally bestselling thrillers that blend historical intrigue, religious scholarship, and modern suspense. A lifelong researcher of rare manuscripts and Church history, he draws on extensive archival study to craft narratives rooted in authentic detail. His work includes the Vatican Secret Archive Thrillers, the Magdalene Chronicles, and the Vatican Archaeology Thrillers. Before turning to fiction, McAvoy built a distinguished career as an entrepreneur, technology consultant, and collector of historical documents. He now writes full time from the Pacific Northwest, where he continues to explore the shadowed crossroads of faith, power, and history.
Catch Up With Gary McAvoy:
GaryMcAvoy.com
Amazon Author Profile
Goodreads – @garymcavoy
BookBub – @garymcavoy
Instagram – @gary_mcavoy
X – @GaryMcAvoy
Facebook – @GaryMcAvoyAuthor
Tour Participants:
Tour Host Info:
Book Formats: ePub, Print, Audiobook
Hosting Options: Review, Interview, Guest Post, Showcase
Giveaway: There will be a tour-wide PICT Giveaway
More: According to the author The Medici Heresy is considered to be PG-level content or less. Readers may still encounter potentially sensitive material. If you have specific trigger or content concerns, please contact Partners in Crime Tours directly for more detailed information.
