“[G]lass-and-novelty-shop”/”low-demand old film-cartridge emporium” and “spurned” F.L.Q. “front-operation” run by Lucien and Bertraund Antitoi, “just up Prospect St. from Inman Square in Cambridge’s decayed Portugo/Brazilian district” • whence Pemulis obtains 650 mg. DMZ, aka ‘Madame Psychosis’ • where Entertainment-seeking A.F.R. find themselves “turning all the stones.”