Sinatra acts dour and drudgy well, with a good ensemble cast- but all are hamstrung by the script. Robert Duvall is among the support players. It almost feels like a Columbo script in New York.
Lee Remick is excellent with a "juicy" womans role , Sinatras estranged wife- the best played part of the script, not that the writing helps the actors too much- they are good despite it , not because of it. (This may have had personal undertones for Sinatra in view of his divorce from Mia Farrow...).
The main "case" and how it develops just appears absurd now.
Nearly a waste of talent redeemed by the conviction of the ensemble, and one hearfelt "speech" from Sinatra about the rich exploiting the slum tenants. Script 2, Cast 3 and Lee Remick 4 out of 5