Grindelwald is an underworld kingpin who grows fascinated with Newt after finding out he can smuggle just about anything in between countries. Newt is a biologist-turned-smuggler by circumstances. As soon as he finds out Grindelwald wants him to traffic drugs/weapons/women, he flees to the USA.

Young and demoted police officer Tina finds him. She's set on bringing him to justice, if only her boss, Captain Graves, would listen to her! But Captain Graves only cares about this kingpin who's apparently set his foot on american territory looking after some precious cargo.

If you find a way to fit Credence into this plot, I'd absolutely love ya.