This Drew Barrymore movie combines elements of a mystery, romantic comedy, and slasher film. Following a murder in New York City, a young woman—played by Barrymore—relocates to Los Angeles, where she finds herself sharing a living space with an aspiring writer (George Newbern). However, it appears her dangerous other self has come along as well. "Doppelganger," released in 1993, presents a diverting narrative alon…