On paper, Veronica has no right to be as good as it is. The plot description is riddled with horror cliches, including the dreaded "based on a true story" text. There's even a marketing campaign for its Netflix release about how people are turning it off because it's too scary to finish (at least a dozen of those articles popped up shortly after the release, and more followed--it's purely advertising, and it’s good).
It's a horror film about a teenage girl, immature for her age, attending a Catholic school and caring for her siblings while her single working mother runs a bar to keep everyone afloat. The girl decides to use a Ouija board to summon the spirit of her dead father and unleashes a living hell on her family instead. Complete with creepy stern nuns, rampant hormones, mysterious cuts and bruises, and not one, not two, but three significantly younger children who are equally creepy as they are cute, and you should have, in 2018, a mess.