Madness Banda sonora (2006) BSO

Alex is a disturbed young man bent on destruction, but his plans are interrupted by his step-sister and her four, hot college roommates. Confined to their parent's house as a blizzard moves in, the power goes out and one of the girl's 'accidentally' dies making Alex's odd behavior more suspect. He tries desperately to cover his tracks, but discovers an even darker deed and in the end.