The members of S-Squad are looking for a break from their run of cold climate travails. So when a seemingly simple mission in Amazonia comes their way, they are looking forward to some welcome warmth. What they get is oppresive heat, biting insects, and a dredging operation on the river with a snake problem. A big snake problem. Soon they are in a fight for survival. The old snake gods of the river know the waterways much better than our Scottish...