From Canada's waterlogged wilderness come stories of a twenty-foot lake monster that attacks humans. Freshwater detective Jeremy Wade tries to track down this shadowy predator with a mouth said to resemble a bear-trap.

Jeremy Wade is lured to the shores of the Mekong River in Cambodia to search for a monstrous fish that has mauled and mutilated several people.

Jeremy goes to Fiji to investigate reports of people being attacked underwater and tries to find out if there are multiple culprits or if a single perpetrator is to blame.