Night Caller (1976)

Disturbed pervert loner Robert (a nicely slimy portrayal by David Book) gets his sick kicks making obscene phone calls and spies on his beautiful neighbor Carol (attractive slender brunette Monique Starr) while she's doing the deed with her husband (rugged hardcore movie stud Ken Scudder). Robert's obsession with Carol causes him to go dangerously around the bend.

Before writer Dean Rogers and master director Anthony Spinelli reached their peak (with such hits as TALK DIRTY TO ME and SEXWORLD) they cut their filmmaking teeth on NIGHT CALLER, worth seeing but far from a complete success.It's presented as a case history of a pervert, Robert (David Book), a guy who we discover is fully capable of carrying sex acts to their fruition (read: money shot), but gets off on harassing women with obscene phone calls.