The Postman Always Rings Twice1946

Sackett:
Suppose you got a stay of execution, a new trial, and acquittal of killing Cora. Then what? Last night, they auctioned off the fixtures of the Twin Oaks. The man who bought the cash register found a note in the back of the drawer. He brought it to me. It's addressed to you. Cora wrote it. It's a very beautiful note, Frank, written by a girl who loved a man very much. I imagine it was written earlier the very night she died. A note of farewell, isn't it?

Frank:
She did try to run away that night.

Cora:
And since she had no idea anyone would ever see that note but you, it therefore has in it just enough of a confession to convict you of helping her kill her husband. So, if you were to leave this room because you didn't kill her, you'd soon be right back here again for helping her kill Nick. What's the use?

Frank:
Then, then what's gonna happen to me is not because I killed her?

Sackett:
No, laddie. For killing Nick.

Frank:
You know, there's somethin' about this that's like, well, it's like you're expectin' a letter that you're just crazy to get. And you hang around the front door for fear you might not hear him ring. You never realize that he always rings twice.

Sackett:
What's that?

Frank:
He rang twice for Cora. And now he's ringing twice for me, isn't he?

Sackett:
That's about it.

Frank:
The truth is, you always hear him ring the second time, even if you're way out in the back yard.