Jessica and her possessive lover Josephine invite Anders in when it appears he's hurt.
After dispatching a young couple, the alien assumes the identity of the recently dispatched young man.
Then he discovers that his city is being terrorized by a slasher who is stalking and murdering women on the streets.
Soon Jessica becomes suspicious of Josephine's overbearing ways, and relies more on the alien for support, but his purpose on earth remains unclear.