Identical twins Leni and Gina have secretly switched places for years. But when one sister disappears, both of their lives start to fall apart.

Americans Amy, Stacy, Jeff and Eric look for fun during a sunny holiday in Mexico, but they get much more than that after visiting an archaeological dig in the jungle.

After picking up a traumatized young hitchhiker, five friends find themselves stalked and hunted by a chainsaw-wielding killer and his family of equally psychopathic killers.