I can't remember, now, which ones I've read and which I haven't.

It's been many years but I thoroughly enjoyed these 3 novels... not similar to Hillerman other than the locations and they are 'mysteries'. Basically some modern day archaeologists make discoveries and try to unravel the meaning.... then the authors take you back in history to tell the actual story of the artifacts..... .this is back and forth throughout the novels. This is the first of a three part series... if memory serves, and I think it does, the first can be read 'alone'... it's not a 'continued' series, as such.

The Visitants