Deep in the steaming jungles of Paraguay, Aimee Weir is in trouble. The petrobiologist has found what she was looking for - a unique microorganism in a natural gas deposit - but it proves to be more destructive than anyone could have imagined. A contagion is striking down all in its wake. The camp is quarantined, but workers start to vanish in the night.

Is it fear of contamination - or has something far more lethal come to the surface? Something that has been trapped beneath the miles of stone, waiting... for us.

Alex Hunter - code name Arcadian - and his Hotzone All-Forces Warfare Commandos must be dropped in to the disaster area to do whatever it takes to stem the outbreak. It has been a year since Aimee has seen Alex; she thought she had left him for good. Now she needs him more than ever.

In the sweltering jungles of South America, the Arcadian must learn to master his violent inner demons for this rescue mission to have any chance of success. But can he survive long enough to confront the danger that threatens the very survival of mankind?