Now that you mention it, I do believe that elements of voodoo play a role here. Drusilla seems to be related, perhaps in a role of voodoo priestess. She regards her dead sister (how did she die?) as still living somehow, and she deals in fetishes. Those fetishes seem to be particularly important. Firsty, there is the lucky rabbit's foot that was stolen from our pocket, presumably by mr. top hat. Secondly, there is an unspecified talisman hanging by our door. It was also a gift from Drusilla.
Ooh, intriguing connections. I hadn't even really twigged to that talisman by our door and had to go back to check it! Well remembered.
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"