Own the rights?
I'm afraid the other poster may be misremembering--I believe they are thinking of Bad Ronald, another ABC TV-movie of this period. Crawlspace, anyway, is about a retired couple who discover a young drifter living in their--surprise!--crawlspace and attempt to "adopt" him to fill a void in their lives. They try to socialize him and include him in their new "family," with tragic results.I bought a used copy of the book online. I haven't read it since 7th grade, but so far it is just as good as I remember. My recollection is that the movie is entertaining, but not as good as the novel. Arthur Kennedy and Theresa Wright were both excellent, and it was pretty suspenseful for a movie-of-the-week.
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