Charlie sorted through the questions, deciding to which order to answer them in. "Magic's got rules, and I have to work in them. And I don't have the skills needed to just read your mind, although at least one of the several factions involved in this mess does. It's a rare magic, legilimency, and the only legilimens I know off the top of my head? is the bloke who was holding Harry's body in the photo in the newspaper.
"But that's not why I think Harry's dead. There's a long chain of logic here that I don't want to go into--" Charlie raised his free hand to silence the anticipated protest "--not because you're stupid but because it relies on a lot of logic that would take days or even weeks to explain, but short form is I knew Harry pretty well and I work for a Department of Weird Shit, so I notice things. And I noticed things about Harry that were wrong."
Merlin, he was going to get this friend of Harry's killed. But he needed someone outside the factions of the wizarding world, and with Bas back in service, a second gun at his back to complement his wand wouldn't go entirely amiss.
"I suspect, but can't prove yet, that Harry died some time ago and there's something out there wearing his appearance. And if it killed and replaced him, I need to deal with it, because weird shit like that is what I deal with. Dudley was killed to cover up, because he noticed something off. Who's the next most likely person to notice a change in Harry's behaviour? The person who lived with Harry."