I’ve been sitting at Involved in the Soul Trade 6 and A Merchant of Souls 3 for about a week now, and I can’t seem to find the continuation of the story. Is it a random card that I need to draw, or am I missing something?
If it is not at your lodgings, it should be a random card that needs to be drawn. It should appear within a day or two.
Check Watchmaker’s Hill and Ladybones Road. Those are the only two locations I can remember where there were pinned storylets. If there’s nothing there, you’ve probably just had bad luck with the RNG, but it could be a bug. Consider sending support a ticket if nothing turns up in the next few days.