Rounding out his "Diaries" trilogy, filmmaker James Avalon jettisoned some actors and moves away from the earlier themes, but the story is still interesting enough and the sex well-staged to hold one's attention.
Stacy's back, writing her experiences down while lolling in her bathtub. The romantic setting of candles and flowers was recycled by Avalon several years later for his "Erotic Stories" vignette films for New Sensations, which should yield a feeling of deja vu for "Diaries" fans.
Villain this time around is Evan Stone as a family lawyer up to no good. He blackmails Stacy regarding the violent events that culminated Part 2, even though that film ended with Stacy and thereby auteur Avalon indicating that the climax never happened but was merely imagined by her and set to paper. I guess double revisionism is at work.
After humping her, Evan forces Stacy to corrupt good girl Gwen Summers, a talented actress who starred memorably for Avalon in his "Nothing to Hide" trilogy. The machinations are interesting, but the original thrust of the first two films gets lost in the shuffle.
Most disturbing to me was Avalon's rather arbitrary replacement of Laura Palmer in the key role of the brothel madam Lavia by Eva Slovak, a quite dissimilar actress. I found this confusing, and IMDb identifies Eva as a one-shot so it's not clear what's going on here, other than Palmer probably otherwise engaged at time of shooting, though she receives a pseudonymous producer credit.
Also missing in action are all the male leads of the previous two films. Key protagonist Tony Tedeschi, Stacy's surgeon of a husband, is mentioned throughout but never shows up - a structural flaw. Technical credits including 35mm cinematography by Jane Waters are all top-notch.