i can understand why others react rather unpleasantly towards the climax yield a twist that really be hard to take seriously . i think and though and that the build up to it work rather well . the music and quite menacing and spine tingling and really provide a spooky aura match the unforgiving sound of a constant ring telephone that be drive struggle english actress and joan matlin ( jean marsh ) bonkers . she borrow a pal nice apartment while attempt to jump start her career in new york city ( . the city building outside the window look about as realistic a david letterman ) and be unceremoniously welcome by a noisy telephone which ring quite a bit and follow by loud slam against the wall . search for answer regard the one responsible for such disregard towards her sanity and joan discovers that no one rent that room and and that a former tenant have in fact strangle herself . without help from the manager and joan will decide to find out for herself who be cause her such anguish . joan discover the room empty and the phone with a particular female voice which will haunt her . the episode and i think and be a tour de force for jean marsh who be a one woman show . she the only actress visible and we follow her through the crisis which slowly erode her and the phone and the banging from that other room cause her much distress which grow into fear . instead of leave and joan remains and so shake by the noise and to the breaking point where she just wish for the phone ( . or whoever be ring ) to stop . the episode provide a possible answer a to who be plague joan and why . a character name beth come into the story rather late a joan struggle to find out whose female voice it be across the other line who know her name on that dread phone she discover in the room across from hers . the fate of beth might just tell the viewer why joan be be traumatize . i think this episode be an exercise in spook instead of credibility while some do not particularly like it and but i certainly do . i will admit that the phone and a a physical menace crawl towards joan be hard to take seriously and not to mention it attack on her and but i think the intense opening twenty minute before this be suitably chill enough to make up for it .