Deep in the Vatican Archives, Father Michael Dominic uncovers a Renaissance letter that should never have survived—a plea from Pope Clement VII confessing to the concealment of a mysterious gospel. When the fragile parchment is linked to a forgotten Medici secret, Michael and investigative journalist Hana Sinclair are drawn into a centuries-old struggle between those who guard history and those who would weaponize it.
Their search reveals two lost texts—the Gospel of the Beloved, attributed to Mary Magdalene, and the Codex of Voices, a sixteenth-century record of the Church’s attempt to silence it. As the pair follows Clement’s trail from Florence’s ruined chapels to the hidden vaults of the Vatican’s Riserva, they confront a truth that challenges not doctrine but conscience: how far faith will bend to preserve itself—and how love endures when power demands silence.
THE MEDICI HERESY, the twelfth thriller in the Vatican Secret Archive series by bestselling suspense author Gary McAvoy.
Coming December 1, 2025
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GARY MCAVOY is author of several books including his bestselling thriller series “The Magdalene Chronicles,” and his newest series, “Vatican Secret Archive Thrillers.” His nonfiction work “And Every Word Is True” has been hailed as a sequel to Truman Capote’s landmark book “In Cold Blood.” Gary is also a professional collector of ancient manuscripts and historical documents, much of which informs his writing projects.
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Vanished women. A rising body count.
A detective who won’t quit.
Detective Kylie “KC” Cassidy thought Major Crimes would be her big break. Instead, she’s chasing the brutal murders of young women—and the trail keeps circling back to Assistant State Attorney Gavin Watkins and his elusive ally, Kozlov.
Each lead vanishes before her eyes, every step forward dragging her deeper into danger. And when Kozlov’s men come after her, KC must rely on her instincts, and on the few people she can trust, to survive long enough to expose the truth.
But when KC gets too close to the truth, she becomes the target. Will KC survive the trap and bring down the predators or become their next victim?
FATAL INVITATION, the first crime thriller novel in the Detective Kylie Cassidy series by S.F. Baumgartner.
Coming December 8, 2025
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