Grace, her boyfriend Adam and her younger sister Lee are on holiday in Northern Australia and decide to take a river tour with Jim, their guide.
As they drift into a mangrove swamp their boat is suddenly capsized and Jim disappears. Realising they've been attacked by a crocodile, Adam drags Grace to the safety of a tree whilst Lee clings on top of the overturned boat. Adam and Grace frantically try and manoeuvre Lee and the boat to the tree but it is firmly stuck.
Stranded in the flooded mangrove swamp, the three holiday makers must work out what to do survive. They must somehow elude a man eating crocodile, reclaim their overturned boat and get back down river alive. But will they make it???