Extreme angler Jeremy Wade embarks on another mission in South America to follow up reports of a colossal fish that is said to swallow men whole. Some call it the lau-lau, to others it is known as the piraiba. In twenty years of criss-crossing South America, Jeremy Wade has never seen a specimen big enough to convince him that the fishermen's tales are true. If this gigantic beast really exists, then perhaps the place to find one is in a remote and little-known backwater of Guyana.