The Codex of Man. The Unseen Order, #1

Centuries ago, a clandestine order of warriors, handpicked by the Vatican, emerged to safeguard the Church's most explosive secrets, and eliminate any threat to its sanctity. Thus, was born the Unseen Order-a fearless assembly of men and women, dedicated to preserving the faith at any cost. From battling heretics and mystics to thwarting relic hunters, they operated in the shadows, facing perils beyond imagination. But their most harrowing trial came in 1922, when a fateful mission unleashed Christianity's most perilous secret upon the world.
Now, in the modern era, a sacred manuscript vanishes from what was deemed an impregnable vault. In the wrong hands, this ancient scripture could shatter the very foundations of the Vatican, bringing the Catholic Church to its knees. Enter the Unseen Order, charged with a mission of paramount importance: retrieve the stolen tome, neutralize the heretics who seek to exploit it, and safeguard a truth that has remained hidden for millennia.
Brace yourself for a pulse-pounding journey into the heart of mystery, where the fate of faith hangs in the balance and every step taken could alter the course of history.