An idyllic wildlife cruise disintegrates into terror when a party of tourists are stalked by a massive man eating crocodile. Pete McKell, a cynical American travel writer, joins a disparate group of holiday makers on a river cruise through the waters of Kakadu National Park. Initially Pete clashes with their tour captain, Kate, a feisty young woman who assumes he is just another city slicker in search of a quick thrill. After an uneventful day cruising the river, Kate is reluctantly persuaded to steer their boat into unexplored territory. They discover a secluded lake but terror strikes when their craft receives a powerful blow from beneath the murky depths and begins to sink...