Hello, I'm trying to figure out the name of this (I believe) made-for-tv movie from the early 80s. It was based off a book about a twisted teenage girl (I want to say her name was Robin, but I'm not sure) who lives with her recluse writer father in New England. She kills her step-mother, and a few others and buries them in the backyard. She also has this dorky boyfriend who's convinced he's a magician. It's not a horror movie or even a thriller. She seems to kill off these people rather matter-of-factly...just because they're annoying. I've been going crazy trying to figure out the name of this movie, and would be eternally grateful to anyone who would know the title (or could point me in the direction of finding it out) Thanks!
