Who said "We are trapped with a murderer among us."?

This quote is attributed to Armstrong.

We are trapped with a murderer among us. - Armstrong

"We are trapped with a murderer among us."

Armstrong Fear

Character in And Then There Were None

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"We are none of us infallible."

"The innocent suffer with the guilty."

"Each of us has something to hide."

"We deserve what comes."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."