We're looking at Chapter 26 in which Dresden has incredibly vague conversations with the Summer and Winter Mothers.
Summer Knight Chapter 26 Summary:
Dresden sprints to the Summer and Winter Mothers. The mothers and him agree to go quid pro quo for answers to their questions. Dresden makes the connection that Aurora is responsible for the loss of the Summer Knight’s mantle. Just when he attempts to leave, he is ambushed by Grum and Elaine.