Hannibal's backstory in mostly in 'Dead and Buried', the 9th book. There's a few very subtle hints here and there in earlier books, but not enough to really put it together before that.
Hmmm.... is it important that she doesn't know? In 'Wet Grave' (book 6) Hannibal is canonically out of town- though she and Ben get letters from him- and in 'The Shirt on His Back' (book 10), both Ben and Hannibal leave while she's still in New Orleans, and they're out of range of letters/word.
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Hmmm.... is it important that she doesn't know? In 'Wet Grave' (book 6) Hannibal is canonically out of town- though she and Ben get letters from him- and in 'The Shirt on His Back' (book 10), both Ben and Hannibal leave while she's still in New Orleans, and they're out of range of letters/word.