Profit, conflict, blood, time, nobody knows their motive. Everyone fears them. You can pay off your debts to them, in perfect silence.
In the Occult world, they're known. But they honor none, though through the silence Cindered Tally they acknowledge one power. They divorce themselves from other occult operations, and instead are feared by every criminal gang in Europe. That's not to say they can't be negotiated with of course, but they sit in the liminal space between caring about things beyond mortal money, and not giving a rats ass about whatever an adept is offering.
Still, they prefer to remain below notice, and you can find their weaknesses in vice, and the space between material and immaterial.