Hey Guys, I'm no baker but was racking my brain with the "keystone" breadcrumb. Was re-reading Dan Brown books over the 10 days of darkness to try and find masonic or symbolic meaning behind "Keystone".
Guess what? I did some further digging. It turns out 25th October 2017 a law firm announced that Dan Brown was being sued for plagarism over his book "The Davinic Code". The law firm prosecuting is named KEYSTONE LAW - based in the UK.
I'm going to research it further, but bombs away guys. Hopefully this is a lead?
https://www.keystonelaw.co.uk/about-us