Bella is hanging out in a Jarvis - the familiar one - handwriting a nonaggression proposal-slash-bribe. Has to be handwritten. Damn fussy demons. At least it's okay for her to conjure rather than personally harvesting the weird ink she's supposed to use.
[Sherlock, you getting anything worth knowing?]
[The bath lady's name is Glorificus, Glory for short; her alter ego is Ben, a perfectly ordinary human except for occasionally turning into her. She seems to derive power or sustenance from sucking... something... out of people's brains. Her past victims can be cured at a pentagon per, but I only did the most recent one. The rest are either dead or in mental hospitals.]
[I am as sorry as I should be,] Bella asserts to Glory.
[Ballpark of two or three hundred so far. Ben knows a thing or two, and you might have more luck getting it out of him than out of her.]
[How do the obsequious demons react to him if one's around when he shows up, then?]
[I'll hang around and wait for him, then, unless she lines up another snack.]
[If you get impatient, you could always see what kind of coin it takes to force the change.]
Bella starts trying coins, but she's going to stop and reconsider if a pentagon won't do it.
[You can reply to me the same way,] she adds helpfully.
[I found your alter ego, first, and I want to find out why she's been brain-sucking several hundred people and put a stop to it.]