The only hitch was a man named Nunheim who had found out something.
7 seconds sound clip from the The Thin Man (1936) classic radio play.
You can hear this line at 00:49:55 in the radio play.
Quote context
[...]
- Is that true? I don't know. Why are you saying it? It's the only way it makes sense.
- His plan was still working beautifully.
- The only hitch was a man named Nunheim who had found out something.
- Our hero bumped him off too.
- So the murderer picked on poor Mimi here to strengthen his case.
- Mimi is the only one at the table who can tell us who the real murderer is.
[...]