A note has been pushed through under the door of Bellemy's place at Necropolis. Even without the signature, the use of pencil and the pretty characteristic handwriting would make it pretty clear whom the message is from.

'Got time for a meeting ? Thought it'd be good to compare notes, also, I got some things I want to talk about. Maybe you also got something. Let me know when/if you're available and I'll give you the details.
-HK'