One forensic geologist. Two dead men. Over five hundred witnesses. And yet no one seems to know what really happened.

It’s up to FBI agent Raleigh Harmon to solve the case—and fast. But with tight-lipped witnesses and increasing pressure from city officials, Raleigh must rely on her instincts, her training in forensic geology, and her determination to close the case. One thing is for sure: If no one else will talk, the stones will cry out.