…overshadowed walls — occasionally also turning a fascinated eye towards the dimly gleaning mirror — I began to recall what I had heard of dead men, troubled in their graves by the violation of their last wishes, revisiting the earth to punish the perjured and avenge the oppressed; and I thought Mr. Reed’s spirit, harassed by the wrongs of his sister’s child, might quit its abode — whether in the church vault or in the unknown world of the departed — and rise before me in this chamber.
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He wants to avenge the murder of his brother
You are the representative of justice here, and it is for justice to avenge those she has been unable to protect.