The world is still reeling from the tragedy of the Zoo's recent massive outbreak. It failed, but does this mean it's defeated? Born from the fertile imagination of bestselling author Michael Anderle... Sal knows better, but can he convince others that this was simply a prelude to something even more terrifying? Or will greed and politics continue to feed on the spoils of humanity's greatest enemy and ignore the terrible cost? While Heavy Metal expands their team in preparation for the inevitable hostilities, the Zoo begins its insidious campaign. With the Zoo bases swept into a frenzy of inexplicable attacks and feints by the alien jungle, can Sal and his team discover the purpose behind them in time? Beyond the obvious skirmishes and the new crop of monsters, is there something even more sinister at work? Will Sal be able to identify it before the Zoo's secret weapon destroys the wall that is humanity's only defense? Or is this the tipping point where human courage, determination, and ingenuity are finally overwhelmed by an alien intelligence far greater than anyone could imagine? After all, how do you fight something you cannot see?