Lady Miranda knew her husband far better than her father in law.
So given just how much the man was sweating and stuttering at all their questions, she could smell the rat from miles away.
If the events had truly unfolded as described by Lord Nolan, then she was pretty certain her man would not be acting like this.
He would be the first to jump up and defend their actions at the top of his voice.
Because that was the type of man Lord Cassius was.
When something was true and valid, he would be like a lion, presenting and defending it to the extreme.
But whenever there was anything false or perfidious, he would be like a scared cat, muttering and shifting his body all over.
Just like now, when he did not even bother to help his father up.