The first rule of the market is you do not talk about the market.
When a mysterious invite arrives in the mail and Father Menchu responds by whisking Sal off to Lichtenstein, the former cop is left on very new ground as she gets more than a glimpse at the broader world of magic users. Unfortunately, they are immediately confronted by a wealthy businessman who is less upset about them blowing up his boat two episodes ago than he is about them stealing his (sludge-demon releasing) book. When the three remaining team members back in Rome suddenly find themselves under attack, Sal and Menchu are left scrambling for how to help and have to turn to the peculiar techno-cultists whose computers run on seahorses and have a pointed interest in the cop sister of their acquaintance, Perry. Welcome to the Market Arcanum.
This episode is brought to you by team writer Margaret Dunlap, who shows us that the society is far from the only fish in the magic-hunting sea - and certainly isn't the biggest.