This “Welcome to the Blumhouse” horror film, released alongside three others on Amazon Prime, feels like a budget-minded take on "Black Swan," or perhaps even more closely resembles "Perfection," which is available on Netflix. The familiar high school storyline proves to be a significant distraction. The plot doesn’t offer much that hasn't been seen before: a character dies early on, the central figure discovers an unsettling book, and then things begin to look promising for her—or at least it seems that way. I honestly can’t say why they chose the title "Nocturne"; maybe it has something to do with the ominous book? It's best to skip this one entirely and watch the “Suspiria” remake instead; it’s considerably stronger.

Source on TMDB