Heartache and horror walk hand in hand in “Fingernails,” a disarmingly sweet science-fiction romance from the Greek director Christos Nikou. Opening with a brief explanation of the title — the first sign of heart disease is often noticed in the fingernails — and closing on a note of indescribable yearning, this gently humorous movie operates so smoothly you may not notice its subversiveness. Though comfortably settled with her longtime boyfriend, Ryan (Jeremy Allen White), Anna feels strangely lost: Ryan is sweet but dull, their interaction as predictable as the job interviews she disinterestedly pursues. Responding to a crisis of dwindling romantic partnerships, scientists have developed a test that can determine whether you and your significant other are truly in love. Years earlier, Anna and Ryan had passed the test with flying colors; so why was she feeling so restless, and so attracted to Amir (Riz Ahmed), her handsome new work colleague?

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Persons: Christos Nikou, Anna, Jessie Buckley, Cameron Diaz’s, John Malkovich ”, Ryan, Jeremy Allen White, disinterestedly, “, Amir, Riz Ahmed Locations: perm