Thirty Pieces: The Lost Templar's Secret in Bloomington, MN

What secrets did the Knights Templars have that would endanger the church's existence? Was this the reason they were destroyed? Why then, when they fled underground to avoid destruction and persecution, they still kept these secrets locked away? Why to this day were certain elements willing to do anything to destroy it or those who would reveal it?
Follow the trail of deception, corruption, murder, and betrayal to the ultimate conclusion. It will amaze the reader.