Australian thriller from directors David Nerlich and Andrew Traucki. Grace (Diana Glenn), her boyfriend Adam (Andy Rodoreda) and her younger sister, Lee (Maeve Dermody), are on holiday in Northern Australia when they to decide to take a tour down a river. As they drift into a swamp, their boat suddenly capsizes and their guide, Jim (Ben Oxenbould), disappears. Adam drags Grace to the safety of a nearby tree whilst Lee attempts to cling to the top of the overturned boat. Stranded in the flooded swamp, the three holidaymakers must work out what to do to survive.