"There have been a great number of undiscovered crimes," I argued.
"Don't mean the police, but the people that are right in it. The family. You couldn't really hoodwink them. They'd know."
"Then," I said, much amused, "you think that if you were mixed up in a crime, say a murder, you'd be able to spot the murderer right off?"
"Of course I should. Mightn't be able to prove it to a pack of lawyers. But I'm certain I'd know. I'd feel it in my fingertips if he came near me.