When a massive earthquake strikes California no one could have predicted the astonishing discoveries that were to follow: as a swimming pool sinks into the earth, it reveals the entrance to a previously unknown cave. Archaelogist Erica Tyler knows this could be one of the finds of the century, and when she arrives at the scene her instincts are proved right: she finds an age-old cave painting, whose vibrant colours and symbols mark the world of the shaman; a pair of spectacles that predate known European colonisation; and further strange and astonishing artefacts. But most astonishing of all are the human remains of someone known only as the 'First Mother', dating back almost 2000 years. However, angry local homeowners want the cave filled in and their lives back to normal as soon as possible and Jared Black, formidable campaigner for the Native American Heritage Commission, wants the site claimed for the relevant tribe. Erica refuses to back down as a childhood of foster homes meant she grew up never knowing her real identity and she won't let the First Mother be consigned to history in the same manner.