Robson begins his journey at Lake Kariba in Zimbabwe, Africa, where he hunts down the vundu catfish, known locally as the `steam train' because of its strength. He also examines the kapenta fishing industry, which is integral to life in the country because it provides protein for the low-income populace. In Victoria Falls, he has to prove his courage when angling for tiger fish in a deep pool called the `boiling pot', before braving the grade five Zambezi whitewater rapids.