Hanna Bergholm's Finnish chiller "Nightborn" shook up Berlinale's competition, with some viewers laughing during its violent scenes. But its star, Seidi Haarla, isn't laughing. "We were dead serious while making it," she tells Variety. Haarla plays Saga, who moves with her British husband, Jon ("Harry Potter" alumnus Rupert Grint), to a house surrounded by a Finnish [...]