While we're talking about mysteries that offer some insight into earlier cultures - not to mention archaeology - let me point out a young, relatively new author who is now writing very good, traditional mysteries that include some fascinating insights into remote cultures. I recently read Gigi Pandian's first book, Artifact, which is the first of her "Treasure Hunt" mysteries featuring historian Jaya Jones, whose ancestry - Indian and Scottish - comes into play in Artifact.
To quote the blurb:
"When historian Jaya Jones receives a mysterious package containing a jewel-encrusted artifact from India, she discovers the secrets of a lost Indian treasure may be hidden in a Scottish legend from the days of the British Raj. But she's not the only one on the trail."
It's an interesting traditional mystery, with some thriller/chase elements as well, well-clued, with a lot of very interesting details about both Indian art treasures and Scottish folklore. There are some interesting twists in the story as well. It's a light and entertaining read. Artifact, published in 2012, was the first book in a series which is continuing (as far as I know), and I'll be looking for her other books as well.