This reminds me alot of William Blatty and is about as good as his "Sorcerer" if not "The Exorcist". An estranged couple on a hideously awful (is there another kind? ) camping trip face the truth of their relationship as well as what seems to be a coordinated attack on the part of ALL OF NATURE. We've all had days when everything seems to be going against us, but how often does it involve Sea Cows? So they are in some real hot water for sure at a camp ground you can only find....in the Twilight Zone. 5/5