There's a secret way out through the inspector's private house.
3 seconds sound clip from the The Invisible Man (1933) movie soundboard.
You can hear this line at 00:59:21.066 in the Blu-ray version of the movie.
Quote context
[...]
- I tell you, he's not human. He can go through anything. Prison walls, everything.
- I tell you, I can't sit in that station waiting.
- He'll kill you, kill you all, then take the keys and come to me.
- There's a secret way out through the inspector's private house.
- We'll disguise you as a policeman, and you can walk out with other uniformed men and drive away.
- Even if he sees you, he won't recognize you.
- He'll most probably be waiting in front to break in at 10:00.
[...]