Really, I continued, "it's her extraordinary vehemence against Inglethorp that started me off suspecting her. 
The woman didn't know an Inglethorp or cared about him at all.
mnli hypothesis: The woman didn't know an Inglethorp or cared about him at all. premise: Really, I continued, "it's her extraordinary vehemence against Inglethorp that started me off suspecting her. 