I've probably already pimped a few years ago but Happy Valley is one of the best, if not the best, crime thriller series on Netflix. Sans Breaking Bad because it has more seasons. But Happy Valley's 2 short seasons are balls to the wall right from the start. So, so good. So intense. Think Fargo if you took all the comedy and niceness out of it and made it 100% intense AF.
Allegedly the are doing a season 3 now which I am very very excited for.
You do need subtitles most likely because they have heavy heavy british, scottish, irish accents (wherever they are from).