What surprises Sherlock almost immediately after he first meets Mary? Why is he so surprised by his revelation?

What motivates Mary's aunt, and how does Mary cope with her?

What skills does Sherlock teach Mary before she goes to Oxford, and how does she use these skills while there?

When it appears as though Holmes and his associates are under siege, what does Holmes do that makes Mary angry? Why do his actions upset her?

What does Mary discover about the mastermind's identity, and how does she reach the conclusion she does?

Describe Mary's relationship to Holmes.... to Watson.... to Mrs. Hudson.... to her aunt. What is uniquely different about her family relationship vs. her relationships to the rest?

What two things does Holmes miss, but Mary catches, with regard to the mastermind bomber? Why does the fact that he missed these things bother...