Sean, Kerry and Beth are three strangers whose only common goal is to work out exactly why they have been isolated in a mysterious woodland, beside a shallow grave. With no memory of how they got there and increasing levels of paranoia, the trio become entwined in a nightmarish experience which will ultimately lead to a terrifying sacrifice. But who or what is behind it all and do the answers lie closer to home than they think?

Two years ago, a young woman named Valerie was burned after entering a tanning salon. Now, her twin sister, Rhonda, runs a local gym where, all of a sudden, people are being murdered.

In London, Belgian immigrant Carol Ledoux shares an apartment with her older sister Helen, and works as a manicurist at a beauty salon. Helen uses the word "sensitive" to describe Carol's overall demeanor, which is almost like she walks around in a daze, rarely speaking up about anything. When she does speak up, it generally is about something against one of those few issues on which she obsesses, such as Helen's boyfriend Michael's invasion of her space at the apartment. That specific issue may be more about men in general than just Michael's actions, as witnessed by Carol being agitated by hearing Helen and Michael's lovemaking, and she not being able to rebuff the advances effectively of a male suitor, Colin, who is infatuated with her. One of those other obsessive issues is noticing cracks and always wanting to fix them. While Helen and Michael leave on a vacation to Pisa, Italy, Carol chooses largely to lock herself in the apartment, ditching work. There, she is almost hypnotized...

Several couples head upstate to the country to watch a boat being built. Unfortunately they are stalked by a murderer behind a ghoulish mask.