Dan Brown’s unoriginal “Origin”
Dan Brown and The Priory of Sion in 2017
The idea using Antoni Gaudí as the basis of a conspiracy theory novel has been done previously before.
Esteban Martin, Andreu Carranza
-The Gaudi Key: A Novel (William Morrow, 2008; Harper Perennial, 2009; originally published in Spanish entitled La Clave Gaudi, Plaza y Janes, 2007).
The Gaudi Key being the seven stars of Ursa Major.