Wade travels to Germany where he meets victims of a beast that has been raising its snout above the surface of freshwaters in Europe for the past 700 years. We discover that the Wels catfish is an aggressive predator of man eating proportions.

A man swallowed whole by a fish, a body eaten alive from within. Another penetrated in a most unnatural fashion, yet more with multiple stab wounds. Jeremy Wade is in pursuit of some of the Amazon's most notorious flesh eaters.