"Firstly- I think the term is 'earnest money'?"
With a flourish, Valentin produced a small leather-bound book and slid it across the table to Aurin. It was handwritten in a neat, precise type; a moment's perusal showed it to contain general information about Aurin, his official businesses, and almost a decade worth of notes, observations, and rank speculation about who was or wasn't on his payroll and what manner of international crime he might be involved in.
"Your dossier." the lawyer explained, putting down his coffee cup and carefully polishing the back of his hands with the provided napkin, tapping the corners of his mouth to ensure that none of the shortbread biscuit had stuck. "A replica, of course. To show that I'm serious. This is everything his Imperial Majesty's service knows about your operations--well, everything I have access to, at any rate, doubtless an Inquisitor could do better--which I'm certain you will find amusing and, perhaps, even useful. I trust it will also explain why I think you entirely qualified for the job."
In a sense, such a document was useless. Some spies liked to boast that they knew a target better than the target knew themselves, but it wasn't literally true. Aurin would learn nothing regarding his own businesses, with the possible exception of one or two exploits he wasn't actually responsible for.
In another sense, though, it was invaluable. Knowing what an enemy knew meant that you could figure out which of your operations were untrustworthy or compromised, and which ones were yet safe. It could even, with some work, help you discern how they had learned such things, and knowing who was spying on you was, if anything, better than not being espied upon in the first instance.
Valentin stood, depositing the cloth on the table, and inclined his head towards the waiter, placing a handful of copper avens down where they could see it as a gesture of gratitude.
"When I travel to Dardouen, it will immediately alert people there that an investigation is ongoing, though I trust they will not know it is of them. I will depart shortly thereafter, and--if all goes to plan--they will never see me again. To all appearances, that will be the last of my involvement in anything to come. My presence would raise hackles and close doors, for virtually every person of property in the Duchy has something to hide from His Imperial Majesty's Revenue Service."
"But I understand that you are a student of Traversion. By that magic, then, I will continue to assist you during your stay in the Duchy, and provide any aid which is incumbent. How does this plan strike you?"