The most important thing in here it's that The turn of the screw works as an adaptation rather than anything else. That's why I think the comparison between this TV movie with The innocents (Jack Clayton; 1961) is unfair. Although both films comes from the Henry James novella, Clayton's emphasizes in the ghosts story while one this focus on corruption and evil and character development; it´s a straightforward story but doesn't looses the strength included in the written words. It´s based on a slow pace, but never falls into boredom. And my guess is that, for a proper enjoy of this film, it's a basic thing is to have read the novel first.