I probably shouldn’t have waited almost a week to write about this movie, because the plot was total nonsense right after I had watched it, and trying to parse it out now is basically impossible.
The short of it is Newt is not allowed to leave Britain because of his shenanigans of the first prequel. The Ministry of Magic tries to cut him a deal that he can leave, but only if he helps them hunt Grindelwald down. I think. It may have been to find this other magic guy who Grindelwald is trying to lure to him. This mysterious person is a super powerful orphan magician who is trying to find out where he’s from. Either way, it’s one of those.