Good Lord this movie is bad (spoilers)
There are so many things wrong with the writing in this one.
First, Hillary gets punished for an accident that wasn't her fault.
Then, she finds photos on her phone that someone took of her in the shower just moments before. She also finds muddy footprints in the bathroom, confirming someone is there. But does she call 911? No.
Later, when her friends say they should call 911, she says no. Her reasoning? Because she's already caused enough trouble as it is. As if calling 911 when someone is breaking into your house is "causing trouble."
Yet apparently she doesn't think that needlessly breaking her parents glass table is causing any trouble.
After she escapes the killer, instead of running to a neighbor to seek help, she runs back into her own house, thereby trapping herself once again after she was already free.
She finally puts the killer down by setting him on fire and grabs her cell phone from his pocket. But does she call 911? No. Instead, she goes back into her house (trapping herself AGAIN), seemingly waiting a good number of minutes before finally attempting to call 911, but her call fails and she gets killed.
Good! I'm glad she got killed. Anyone that stupid deserves to die.
But in the end, it's not her fault. She's just a character in a movie. In reality, it's the fault of the writers for writing such stupid drivel.
Also, the killer's S&M mask makes him look like a joke and it's hard to take him seriously when he shows up in that. Not to mention the fact that apparently he drives around with the license plates of the people he murders yet never gets caught. Yea, that's real believable. /sarcasm