Let's start this out with a little chat about horror-movie semiotics, shall we? I knew you'd perk up!
Here's a trope I just adore: I call it The Blood Queen. A beautiful young girl runs a gauntlet of horror movie Hell and comes out soaked in blood. Think Frontier(s). Think Inside. There are all sorts of variations, such as the wonderful Livide, or The Loved Ones where it's a Blood Prince, Xavier Samuel's Brent with his girlishly long and precious pretty hair.
Here it's Courtney Hope as Amber, a girl suffering, it seems, from a bout of the old anhedonia, loss of pleasure, specifically pleasure in food. She blames the environment, the tiny Midwestern town of Famville where she's spent her whole life.
One night her alcoholic mother let's slip that Amber was adopted, and maybe that's the last straw; Amber finally takes action, makes a plan to escape. Get's a bunch of friends: a nerd (Oliver Hawes), a hunk (Joshua Bowman), a pretty boy (Jamie Blackly), a hippie girl (Perdita Weeks), a sexy, independent girl (Ruta Gedmintas), and determined little Amber. She's on some sort of time limit, see, has to make Chicago in about 24 hours. So when the car, driven by the crush-having nerd Eric, breaks down, they all decide to take a reluctantly offered ride from friendly old truck driver Bernard (Bruce Payne, having lots of fun). Pretty soon it becomes apparent that this was a mistake all will live to regret, most of them not for very long, because when they arrive at their destination, and old abandoned slaughterhouse, they are immediately MASSACRED BY BLOODTHIRSTY VAMPIRES!!! AAAAAHHHHHHHGGGGHHHHH!!!!!
What I'm saying is, don't take this one too seriously. It's just dark, teenagery fun!