When investigative journalist Hana Sinclair uncovers a cryptic reference to an ancient botanical manuscript left to by her late grandfather, she unravels a thread tied to Hildegard von Bingen, a 12th-century abbess, healer, and mystic. Her findings reveal that Hildegard’s work holds more than historical value—it may conceal the key to curing some of humanity’s most devastating diseases. But someone is determined to ensure her secrets stay buried.

As Hana teams up with Father Michael Dominic, prefect of the Vatican Secret Archives, and Marcus Russo, a Vatican archaeologist, they discover that a powerful biotech corporation, Zentara, has been systematically suppressing cancer cures for profit. Zentara’s reach is vast, its operatives ruthless, and its agenda clear: control the narrative of medical progress at any cost.

The team races to uncover and protect Hildegard’s work, their journey taking them from Geneva to Rupertsberg Abbey, where Hildegard lived and worked, to Zentara’s high-tech laboratories. Along the way, they face betrayal, danger, and the weight of their own convictions. For Hana, the fight becomes deeply personal, challenging her notions of justice and the role of science in society.

But when Zentara accelerates its plans and begins human trials with catastrophic consequences, the stakes grow even higher. Can the team expose the corporation’s crimes, safeguard Hildegard’s legacy, and ensure her healing vision is not lost to history?

A gripping tale of courage, faith, and the pursuit of truth, The Hildegard Seeds explores the timeless struggle between greed and the greater good, weaving historical intrigue with modern-day suspense in a story that will resonate long after the final page.

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Discover what readers are saying...

“McAvoy draws a fun, twisting fictitious narrative that is as entertaining as it is educational.” — BookLife Prize, 2025

“McAvoy delivers a thrilling piece once more in this series that never seems to lose its momentum.” — Matt Pechey, Reedsy Discovery

“McAvoy succeeds in creating substantive characters within a propulsive narrative.” — BookLife Prize, 2025

“A stunning story and development of yet another strong branch in the Vatican Secret Archives series.” — Matt Pechey, Reedsy Discovery

“McAvoy succeeds in creating substantive characters within a propulsive narrative. His writing is clear, concise, and easy to understand.” — BookLife Prize, 2025