Archaeologist Mark Graham unearths a remarkable discovery while at a dig in the mountains of Zimbabwe – pterodactyl remains and giant human bones buried together. Speculation leads to the possible existence of a mythical race known as 'Nephilim', a pre-flood people alleged to have descended from both gods and men.

But skepticism and sabotage delay Mark and his team as the dig site is compromised, putting their discovery – as well as Mark's very life – in grave danger. Deceived and framed by trusted friends and colleagues, Mark struggles to safeguard his findings and protect his reputation in order to unearth the mystery behind the bones.