Park Service surveyor and former FBI forensic specialist Jack Randall finds himself swept away in a diabolical journey through a mystical primitive world. Following a naked man captured by aborigines, Jack steps through a vortex into a prehistoric 13th century Mesa Verde culture. Accompanied by a shaman of the Butterfly Clan, the shaman's lively and lovely granddaughter and Jack's best friend Spade, he searches the American Southwest 800 years in the past for an ancient Egyptian tablet. To find and possess the tablet, the trekkers must outwit a primeval cult whose high priest, sensuous women and warriors will stop at nothing to reclaim the lost stone. Murder becomes the norm. Loyalties are tested. Jack struggles to piece together the evidence--who among them is eliminating the trekkers one by one for their own selfish ends? The realism of a 13th century Mesa Verde setting comes from Bishop's years of extensive reading about our Ancestral Puebloans.