Bro. Robert Patric Lewis' first fiction book The Pact has a Masonic connection which really starts to build at the end of the first book and he's well on his way to being done writing book 2 with a third book thoroughly outlined to end the series.

Edit: Heinlein like /u/ZealousClay mentioned has some Masonic bits here and there in his books if you look for them, although he was not a Mason.