Looking for a Story, fairly short tale of D & E:

Story is about Darcy receiving info from his attorney that he will lose Pemberly if he does not marry by a certain date very near, and that the estate will go to a Darcy cousin who he knows is a wastrel, and the letter supposedly signed by his father is a recent find. He convinces Elizabeth to marry him, but the attorney accuses him of lying, etc. and Elizabeth figures out what's going on.