Written by a skilled professional thriller writer, the story hums along in a Da Vinci Code/Indiana Jones sort of way. It was a good light read. Light on the history. Light on the tension. Light on the depth of characterization. Even the chapters are only a few pages long to keep you moving along briskly.
Somewhere around 3.5 stars which places it in the region between meh and good. I will probably try a few more of Child's solo efforts as I expect them to be about this level.