‘Nocturne’ looks great but it’s a little off-key

“Nocturne” – “From their struggles to establish dominance over each other, siblings become tougher and more resilient.” – Adele Faber “Siblings that say they never fight are most definitely hiding something.” – Lemony Snicket Vivian (Madison Iseman) and Juliet (Sydney Sweeney) have played the piano for practically their entire lives.  Writer/director Zu Quirke establishes this absolute fact during the first few minutes of “Nocturne”, as we see the girls striking 88 keys as toddlers through high school in a dreamy montage. Practicing for three hours a day for 15 years…