Who said "Someone among us is a murderer."?

This quote is attributed to Lombard.

Someone among us is a murderer. - Lombard

"Someone among us is a murderer."

Lombard Truth

Character in And Then There Were None

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"We are all condemned men."

"Every man for himself."

"Trust no one on this island."

"The sea surrounding us is like a wall"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."