By daylight, Lake Miraton is a charming vacation spot; swimming, hiking, old-fashioned living and the like. It is the perfect place to spend a golden summer's afternoon. But as the sun sets on the renters of cabin 206, they begin to notice that the night brings out something different in the lake. As a malevolent darkness rises up around them, five youths are suddenly forced into a battle for their own survival. Strangers become allies; friends become enemies. Until the sun rises again, nobody will be safe.