The Six Sacred Stones

After their thrilling exploits in Matthew Reilly's bestseller Seven Ancient Wonders, super-soldier Jack West and his loyal team of adventurers are back, and now they face an all-but impossible challenge. For a mysterious ceremony in an unknown location has triggered a catastrophic countdown that will climax in the destruction of all life on Earth. But there is one last hope. If Jack's team can find and rebuild a legendary ancient device known only as the 'Machine', they might be able to ward off this coming Armageddon.
The only clues to its location, however, are held within the fabled Six Sacred Stones, long lost in the fog of history. And so the hunt begins .