Do you think I'm afraid? said Tuppence indignantly, valiantly repressing memories of the steely glitter in Mrs. Vandemeyer's eyes.
Tuppence thought someone may think he is afraid. 
mnli hypothesis: Tuppence thought someone may think he is afraid.  premise: Do you think I'm afraid? said Tuppence indignantly, valiantly repressing memories of the steely glitter in Mrs. Vandemeyer's eyes.