so there's an abandoned cruise ship that holds a factory that produces illegal substances using illegal methods (not coke. like, guns n shit, this isn't earth)
since ships in international waters don't have to obey laws, they can dance around being caught
and basically there's a murder, or maybe a massacre. most people chalk it up to poor working conditions, but a group of people decide to investigate and they find a very very troublesome answer.
I'm thinking of making ekko and her gang do this, but I might just put it in the same world with different people. I made a whole world map for them so it's not too hard to imagine