The Five Greatest Warriors by Matthew Reilly

This brilliant sequel to SIX SACRED STONES picks up the action at a terrifying juncture. Captain West and his small team of elite misfits are on the trail of the six ancient pillars that can prevent the arrival of the 'dark star' a deadly celestial event that could bathe the globe in lethal radiation. But not only have the Ancients have hidden their secrets well, but also the huge potential to whomever locates and uses the pillars has attracted the attentions of the powerful all around the world. Jack West must now fight off crack mercenaries and special forces soldiers whilst preserving his entire team to figure out the secrets of the past...