Thunderhead by Douglas Preston, Lincoln Child

Nora Kelly, a young archaeologist in Santa Fe, receives a letter written sixteen years ago, yet mysteriously mailed only recently. In it her father, long believed dead, hints at a fantastic discovery that will make him famous and rich---the lost city of an ancient civilization that suddenly vanished a thousand years ago. Now Nora is leading an expedition into a harsh, remote corner of Utah's canyon country. Searching for her father and his glory, Nora begins t unravel the greatest riddle of American archeology. but what she unearths will be the newest of horrors...