It is the seat of judgment. The pinnacle of holiness. It is the Ark of the Covenant... and it's the most dangerous weapon in existence. A group of fanatics wearing masks of Egypt's gods slaughter the curator of Cairo's most famous museum. A cleaner in Washington, DC, discovers a decapitated head on top of a replica of the Ark of the Covenant. And someone is sharing videos of the deaths with extremists all over the world. It's a...