- So you think your father did it.
- I don't know, I don't know.

6 seconds sound clip from the The Thin Man (1936) classic radio play.

You can hear this line at 00:18:27 in the radio play.

Quote context

[...]

- Dorothy, look at me? Nick is trying to help you. Why don't you help him?

- You were trying to shield your mother, weren't you?

- No.

- Your father then?

- Yes. My father.

- Why do you think he did it?

- Mother was the first one to find Julia Wolf. She found something in Julia's hand and she took it.

- What was it?

- A watch chain. It belonged to my father.

- So you think your father did it.

- I don't know, I don't know.

- Did your mother turn the chain over to the police?

- No, she kept it. She didn't tell them anything about it.

- But she showed it to you.

- Yes.

- Why did your mother go to Julia Wolf's apartment in the first place?

- She went to ask for money.

- Oh money again, huh?

- Yes? Oh, er... have them come up please.

[...]