They are individuals ... They read (or watch, or listen to) whatever strikes their individual fancy.
What kind of literature do Masons read. They seem to posses the ultimate knowledge synthesis?
I am not a Mason, but I would also claim to have an advanced "knowledge synthesis."
But given that change is the law of us beings who live in time, I would not claim mine to be the ultimate synthesis, nor would I attach such an appellation to theirs.
I've only sat and flicked through their "History of Freemasonry" whilst sitting in an antique shop. If a Mason dies their literature is meant to go back to the Lodges. I think they have a Masonic Bible but I haven't come across it in any charity shops etc. The only famous Masons that I have heard of who have written books are Albert Pike and Manly P Hall. I know a few men who are Freemasons, but most Masons at low levels are kept in the dark as to any secret knowledge they may have.
I can only speak for those I know, but Mr and Mrs Mason, who live next door to me, read detective stories, thrillers, and even a little *ahem* urban fantasy.
(Mrs Mason told me they've stopped buying books now and predfer eBooks. They take less space.)