The Celestial Guardian is an exhilarating thriller that takes readers on a riveting journey into the heart of the Vatican's secretive world and the enigmatic artifacts held within its vaults. The story revolves around Father Michael Dominic, Prefect of the Vatican's Secret Archives, who discovers Leonardo da Vinci's greatest creation—the Celestial Guardian, a machine designed to predict astronomical events. This discovery is initially viewed as a miraculous tool warning of a cataclysmic asteroid headed towards Earth. However, a deeper exploration of Da Vinci's blueprint hints at a secondary, potentially dangerous function of the Guardian that extends beyond mere prediction—the extraordinary power to manipulate celestial events.

This revelation sparks a perilous pursuit for dominance over the Guardian. Its power to transform cosmic events into weapons of mass destruction lures various factions, including a Vatican cardinal blinded by ambition. As religious doctrines change and the Church comes under scrutiny, Father Michael grapples with his own emotional entanglements while racing against time to prevent global disaster. From the power corridors of the Vatican to the forefront of scientific exploration, the story delves into the complex interplay between science, faith, and human vulnerability, offering a thrilling narrative that questions where the line between miracle and science is drawn.

Set against a rich tapestry of Vatican mysteries and celestial secrets, the novel weaves historical intrigue with scientific discovery and human drama. The Celestial Guardian promises a journey filled with suspense, where ambition and the resilience of the human spirit collide amid cosmic threats, keeping readers gripped from start to finish.

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“McAvoy does not disappoint in yet another thrilling novel within this stellar series.” — Matt Pechey, Reedsy Discovery

“This thrilling story combines religious history with ancient science based on the theories of Leonardo Da Vinci’s genius and modern scientific thought.” — Carolyn Walsh, Canadian Reviewer

“McAvoy does a masterful job with this piece to keep the reader wondering until the very end.” — Matt Pechey, Reedsy Discovery

“This is my favourite book in this brilliant series and works as a standalone.” — Carolyn Walsh, Canadian Reviewer

“McAvoy keeps the action high and the predictability low at times.” — Matt Pechey, Reedsy Discovery