'Bones': Will the Gravedigger's trial bring Brennan's letter to light?

Nearly three years after the Gravedigger first hit "Bones," fans will finally see her put on trial early next month.

But we still have one burning question: What the h@%! did Brennan (Emily Deschanel) write in that letter when the Gravedigger buried her alive and she thought she'd reached her end?

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