Alex, Li, Paulo, Hex, Amber. Five kids, who are a highly-skilled squad to help in the international fight against evil.

Flying to Alaska to investigate reports of illegal dumping of toxic waste, they must dive into an icy river, cross the harsh landscape on snowmobiles and mobilise their caving skills to complete their mission.

But most of all, they need courage and determination when they come face-to-face with a man who is ready to kill to stop them.

The team face their toughest challenge yet.