Graham Brown 
Doomsday [EPUB ebook] 

An ancient secret. A terrifying prophecy. The last race against time…In the heart of the Amazon, NRI operative Danielle Laidlaw makes an incredible discovery: a translucent Mayan stone generating massive waves of energy while counting down toward the infamous apocalyptic date: December 21, 2012. And somewhere, there are three more just like it.What power will be unleashed if all four stones come together? Who created them – and who has them now? Using a cryptic Mayan map and a prophecy that points to the end of the world, Danielle and her team race toward answers. But one staggering question remains: Were these artifacts meant to save us – or to destroy us once and for all?