The Shield (en Inglés) - Patrick Jones

The deadliest threat comes from someone who knows exactly how you stay alive.

Marcus Kane has spent twenty-six years as one of the world’s most elite executive protection specialists, shielding presidents, diplomats, and royalty from every conceivable threat. Now, twenty-four hours before a high-profile ambassador steps into the crosshairs, Marcus and his team uncover something chilling: counterfeit credentials, phantom companies, encrypted communications, and a name no one in the protection world has spoken aloud in seven years. Black Crown.

Once dismissed as a ghost story whispered among operators, Black Crown may be terrifyingly real: a shadow network of corrupt protectors who have turned their training against the very people they once swore to defend. They know motorcade doctrine. They understand reaction times. They anticipate every contingency route. And when the first shot shatters marble inches from the ambassador’s head, Marcus realizes this is not a simple assassination attempt. It is a precisely engineered operation designed by someone who thinks exactly the way he does.

With his trusted team of specialists racing to trace an enemy that erases its own existence, Marcus faces a truth more dangerous than any bullet: the greatest threat to the people he protects may come from inside his own world. In The Shield, no one is above suspicion, no protocol is safe, and the line between protector and predator has never been thinner.