If you aren't up for reading the new Dan Brown...
...you could read John Crace's Digested version of The Lost Symbol.
Or even better, you could read his as-he-read-it play-by-play:
Langdon hurried towards the Rotunda. The lecture was due to start in five minutes and he was running late. Still, he was well-prepared. The Symbolism of the Freemasons was his latest research project and what better place than to deliver his lecture than in the hall designed by Benjamin Franklin and so many of the founding fathers of America and Freemasonry? He strode onwards through the clunky sentences and the turgid repetition of pointless information till he reached his destination.