The Knights Templar, keepers of the Holy Grail according to Dan Brown, have chosen a Chicago-area member to be their Grand Master.
Patrick Rea lives humbly in Tinley Park, an outpost of Irish-America. He fields numerous phone calls from those who seek the Holy Grail, and he's admitted to knowing exactly where the sacred vessel is located.
The man has a sense of humor, which is required when heading an organization that a novel turned into a secretive cult.
The Knights Templar began as a police force, set up to protect pilgrims traveling to the Holy Lands in the Twelfth Century. In modern times, they are a charitable organization that has shipped school supplies to Afghanistan and founded a clinic for maternal/infant health in Cameroon.
For all of Dan Brown's mastery of suspense, the Holy Grail that the modern day Knights Templar protect is the vessel of overflowing charity.
Treasure hunters can dig all they like, but the Knights aren't hiding this Grail underground.
As for those who call Mr. Rea, asking about the Holy Grail's location? He's been known to send them to the Tinley Park train station, where they are met by the local police force.