What secrets lie deep beneath the surface?

A deafening explosion rocks a historic Oklahoma City hotel, sending archaeologist Faye Longchamp-Mantooth crashing to the marble floor of the lobby. She's unhurt but shaken-after all, any time something blows up in Oklahoma City, the first word on everyone's lips is the same: bomb.

Faye is in town for a conference celebrating indigenous arts, but is soon distracted by the aftermath of the explosion, which cracks open the old hotel's floor to reveal subterranean chambers that had housed Chinese immigrants a century before. Faye is fascinated by the tunnels, which are a time capsule back to the early 20th century-but when the bodies of three children are discovered deep beneath the city, her sense of discovery turns to one of dread...