On its face, it was an ordinary-looking letter on a legal firm’s stationery.

But in the margin was an internal reference number that had never appeared in Preston’s divorce file.

“This is not something I drafted,” Martin said.

“I joined your counsel team only after the divorce.

I need to establish who prepared it and under whose authority.”

Preston paced beside the window of his office.

“Can we identify the firm?”

“Yes.