The synopsis goes something like this ...

When a homeless man tries to warn several college students that something bad is about to happen, no one takes him seriously. But on their way home after a night of partying, one of the co-eds vanishes. With no leads as to their friend's whereabouts, the college kids search randomly, until the missing girl finds them. Problem is, she's now taken the form of a night creature thirsty for blood.
- Courtesy of Rotten Tomatoes.