That shook Harold quite deeply. Of course it had occurred to him that a wizard that spent a career breaking curses around the world must have seen a thing or two, and possibly even done a thing or two that was... less than salubrious, shall we say, but blood magic was a step rather too far for Harold to even consider. And, there was the small matter of divination being suggested - even if there were true Seers in Sid's family and so on, Harold quite honestly wanted nothing to do with it. Hocus pocus and flim-flammery, as far as he was concerned. Not that he would dare suggest that was his opinion; the curious little man before him was so sincere and earnest but at the same time... he couldn't possibly. The best he could do would be politely refuse and hope that he was polite enough.
"Well, I must say that is awfully kind of you to offer - but I could not possibly impose upon you in even remotely such a way! As much as... there are, well, some things I could not ask anyone to do." Not even if it would answer his questions. "There are boundaries - and I am certain both of us have, rather, dallied around where those boundaries are, but I couldn't possibly..."
Harold sat in silence for a moment, contemplative, before taking a very large deep breath - that he was sure would be remarked upon, but if it was noticed, he didn't really care. "You know, it is rather curious now that you come to mention it - I have not had a single message of any kind from my wife. Even amongst Unspeakables this is... unusual. And I have had a brush-off or two from my colleagues when the subject is mentioned. The clue is, rather, in the title - unspeakable even amongst our own."
The more Harold mulled it over, though, the more curious he felt. There was a part of him growing to ask Sid about what he could fathom with his unusual knowledge of the world, but the better part of him realised he couldn't possibly ask. Colleague or not - friend, or not - there are simply some things one does not just ask for, no matter how well intentioned, no matter whether the offer was even made ahead of asking. Had it simply been a question of divination, he might perhaps have countenanced the matter, but elements of dark magic was quite altogether a different proposition.
"As to my wife's effects, I'm afraid there are none to be had; there may have been some, well, residual effects left behind on the day, as it were, but by the time I had made mention of it to my superiors, there was rather an absence of, well, anything that wasn't mine. I couldn't say for certain if it was like that before or not."
Handkerchief in hand, he mopped his brow - whether there was anything to mop or not, it was comforting. "It's all rather puzzling, you see, and since no-one at the Ministry seemed to want to do anything about it, I made my way here to do my own investigations. But, as you can see, it has so far been for naught."
He cocked his head ever so slightly, and smiled awkwardly, changing tact entirely. "If nothing else, it's a change of pace with people to talk to, books to read, tea to drink, and minds to educate."