Books like The Demon Crown by James Rollins

James Rollins launches a high‑stakes thriller as elite covert operatives chase the stolen bones of the Three Magi across Germany, the Vatican, and the Seven Wonders, unearthing an ancient alchemical conspiracy that threatens humanity.

A global thriller where a series of mysterious murders linked by a Druidic symbol forces Commander Gray Pierce and Sigma Force to decode an ancient riddle and confront a deadly prophecy tied to a hidden Doomsday Key.

As taken from the author website (www.jamesrollins.com): The Rand scientific expedition entered the lush wilderness of the Amazon and never returned. Years later, one of its members has stumbled out of the world's most inhospitable rainforest: a former Special Forces soldier - scarred, mutilated, terrified, and mere hours from death - who went in with one arm missing...and came out with both intact. Unable to comprehend this inexplicable event, the government sends Nathan Rand into this impenetrable secret world of undreamed - of perils to follow the trail of his vanished father...toward mysteries that must be solved at any cost. But the nightmare that is awaiting Nate and his team of scientists and seasoned U.S. Army Rangers dwarfs any danger they anticipated...an ancient, unspoken terror - a power beyond human imagining-that can forever alter the world beyond the dark, lethal confines of the Amazon rainforest for better... and for worse.

When a clandestine group of scientists called the Immari unearths relics from an ancient enemy, humanity faces certain extinction. Only a genetics doctor and a secret agent can race against time to discover the fabled Atlantis Gene and halt the catastrophe.