Based on the true story, two homicide detectives track Martha Beck and Raymond Martinez Fernandez, a murderous pair known as the "Lonely Hearts Killers" who lured their victims through the personals.

Martha Beck: You know what they say about cops and donuts?
Charles Hilderbrandt: No, what?
Martha Beck: Neither one's any good without a hole in them.
Charles Hilderbrandt: They say that about women, too.
Martha Beck: You just as soon see me burn, so you can go home to your little house, your little wife, your little life, and pound you chest little like a monkey. Huh? I take some amusement in denying you and your donuts that pleasure.
Det. Elmer Robinson: Mrs. Beck...
Martha Beck: You can call me Martha, honey.
Det. Elmer Robinson: Martha. My life is a never ending sewer of maggots like you. You're going to grow old and die in an ugly box with bars at one end and a shitter at the other. In a couple years I won't even remember your name. Just gonna be a case file stamped "closed".
Martha Beck: Has anybody ever loved you that much, detective? To kill or die... for you?
[first lines]
Det. Eastman: [to Robinson] Hey, we're all proud of you buster... Charlie... Small town cop dropping a pair like this. You wait a a lifetime never even sniffling this guy.
[chuckle]
Det. Eastman: You want to make a move to the burbs, you let me know. It's a phone call. Hey, maybe you wanna through the switch, I can fix that too.
[laughs]
Charles Hilderbrandt: You're such an asshole.
Det. Elmer Robinson: Were you been? Huh?
Eddie Robinson: You first.
Charles Hilderbrandt: Buster was my partner. We went all the way back to a squad car, for Christ's sake. He was the toughest badge I'd ever seen. Turn more collars than a Chinese dry cleaner.
D.A. Hunt: You've got information on a case we're investigating.
Det. Elmer Robinson: It's actually our case we're investigating.
D.A. Hunt: This is my sandbox, detective.
Det. Elmer Robinson: Well, that's kinda like a fly shitting a pepper, if you catch my drift.
[last lines]
Charles Hilderbrandt: For a long time I didn't understand what he did that day. I figured he tossed a gold shield career into the shitter. But it started to hit me what the job had become for Buster. And for my too. Buster left his regrets, and what didn't work no more, in the Sing Sing Death House, and pushed on for better days. He never looked back.