An art curator decides to seek revenge on his abusive boss by conning him into buying a fake Monet, but his plan requires the help of an eccentric and unpredictable Texas rodeo queen.

Distraught, confused, and half-wild with fear, Sarah Carter emerges alone from the Appalachian cave system where she encountered unspeakable terrors. Unable to plausibly explain to the authorities what happened - or why she's covered in her friends' blood - Sarah is forced back to the subterranean depths to help locate her five missing companions.