For ten years, Abby has monitored her son Jacob and as he approaches his 16th birthday, she worries his eccentricities might be signs of him becoming deadly.
Melinda Page Hamilton's performance puts into the viewer's thoughts the fear of becoming a parent, and speaks for many parents unaware of what their child, usually son, was capable of.
But, while her performance deserves praise, and how the film connects the dots regarding Jacob, I'd submit it leans towards shock value over keeping things rooted by the end of the movie.
Those who love small cast movies, with an intense relationship, and have a interest in a "Will they or won't they" type story regarding Jacob becoming what his mother fears.