how do you reveal lady greys plot.

because i have married her and i heard you could tell everyone the truth about what she did to her sister or something. so how do you do it?

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always on the edge

If I am not mistaken there comes a point in time in the game when it gives you the option to tell on her or not.  If it hasnt happend yet then keep playin the game and then tell on her.

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There comes a time in every young mans' life when he must realize that life is hard and so is he.

what you have to do is...
1.  kill 5,000 grey guards in Bower north
2.  have max gold
3.  hit her 100,000 time with the Bereaver