The Balcony-Scaler, The Train-Feeder, The Skin-Scratcher, and The Pornographic-Men. All serial killers. Their crimes committed the same decade, inside the same city where detectives will lose hope in search of justice.

I like the overall idea, even without a clear protagonist the logline seems to hold its own. I think that if you’re gonna go down the route of each detective taking on a different serial killer, the could be a clearer struggle. You allude to the losing hope in the logline, that seems to be the stakes you’re trying to portray, maybe you can turn it around by giving the detectives something to give them hope, like a lead that could possibly tie the serial killers together.