She told him about the letters, explaining how necessary they were for her father's defence and how she had discovered them.

Mr.Ryder, she said, had seemed to take a fancy to her and had asked her to remain in the house as his guest while she was compiling his biography, and she had accepted the offer, not so much for the amount of money involved as for the splendid opportunity it afforded her to gain possession of the letters.
"So that is the mysterious work you spoke of--to get those letters ?" said Jefferson.
"Yes, that is my mission.

It was a secret.

I couldn't tell you; I couldn't tell anyone.

Only Judge Stott knows.