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It's a public secret that "Winkel 137" (EN: "Shop 137") in Rotterdam is a front for illegal activity, most likely drugs. It's never open during normal hours, the shelves are barely stocked, and no one ever really enters the place. It's been there for as long as I can remember though.
If you look at the place in Google maps you can even see some weird ducts coming out of the wall on the above floor, presumably to clear out some of the vapors coming from the shop.
One of the google reviews after I translated it seems to hint at something:
"I have been living across the street from this store for 3 years now. I only see dark people inside"
Another said
"What a dark store"
Anyway it's odd that a 7+ year old store with a 2.9 on google has survived this long.
That could well be a poor translation of shady
You are correct. "Duistere figuren" could be translated to "shady figures".