The Sixth Number: Part Three

After a near-death encounter with Arnos and two unconventional Russian agents, Joseph and his friends are still at square one.Lukas is still missing and the power of the six numbers is continuing to wane.But hope remains.Now they have possession of Dr Jacobs's highly-sought-after map, a second, unguarded gateway to the tunnels has been revealed.The only question that remains to be answered is: Do they have the guts to use it?They had better make up their minds fast. The world as they know it is on the brink of collapse...