David and Natasha go for a camping holiday in Yosemite National Park, USA. They meet Sophie, a pretty, leggy blonde who suggests that David and Natasha hike with her to a nearby scenic spot near to Mirror Lake for a picnic lunch. An amiable young photographer, Dwayne, a day visitor to the park accompanies them to take photos for his latest scenic photographic book.

The outing proves enjoyable, but Natasha has doubts about Sophie's friend Ava who seems to have a morose demeanour. Their idyllic adventure soon smashes them into reality, when they are drugged and confronted by Sophie and Ava a couple of ruthless serial killers, who kill purely for blood lust and fun.

Will David, Natasha and Dwayne survive the onslaught or will they be killed by a knife or a gun? What will Dwayne's photos reveal?