 One of the Collins girls could and one couldn't commit murder. That's all there is to it. Doc, do you often interview twins? Often, but not for the police. Yeah, yeah, yeah. Well, you like one of those girls. Now, suppose she's innocent, living with a killer. And one of them killed once with a knife. Don't you think there's a chance she'll kill again? Her sister, if she ever became nervous about her? There's no doubt about it. I'll never ask you the name or prove. It's out of the question, Lieutenant. I'm not a detective.