Just saw "Frenzy" (1972) for the first time.
I'll need to check this film out a few more times before making a 'firm' rating.
Overall I liked it - particularly at the end of Act II / beginning of Act III, where the actual villain has to *earn* the crime, frantically searching for a potential incriminating piece of evidence.
The ending is quite abrupt, but thinking about it - there's not really much more to add.