DEEP BENEATH THE STREETS OF SAN FRANCISCO, a murder victim is dumped at an archaeological dig. A note pinned to his shirt warns we will bury you.
The question is, who is you?
Desperate to learn what happened--and what might happen next--investigators bring in forensic geologists Cassie Oldfield and Walter Shaws. They have a reputation for reading the rocks with an X-ray eye, and unlocking a case.
The key to this case is finding out where the victim took his final steps. Tracking mud from his boots, the geologists follow the mineral trail to a startling site at the city's wild edge.
As they rush to learn the connection between this unlikely place and the dig on the other side of the city, they unearth the meaning of we will bury you.
Word by alarming word.
• All books in the series are standalone novels and can be enjoyed in any order.
