**_A killer psycho escapes from the asylum and…_** “When a Stranger Calls” (1979) is low-key horror mixed with detective drama/thriller. I say “low-key” because there’s little-to-no gore, although there’s suspense, chases and flashes of violence. It’s very polished and was obviously influenced by the artistic “Halloween” (1978) except with a very human antagonist as opposed to the indestructible Michael Myers. Then there’s the big city detective element à la “Dirty Harry” (1971) and “Tightrope” (1984), but with a pot-bellied, average-guy investigator (Charles Durning). The film’s best known…