Grindelwald's escape from prison plunged the Magical Association of America into chaos. Percival Graves, the previously rescued Minister of Security, was sent to the home of his friend Theseus Scadman, but the recipient was Newt Scadman.
Newt, who has a communication disorder, and the minister who has PTSD, Credence, who is heavily dependent on the minister and has a tendency to become a black man. They have to slowly clean up the mess left by Grindelwald.
PS, the movie is extended with a mountain of personal settings, including family, friend relationships, etc.