Sorry, can we have spoilers on this please?

I can't watch it until the weekend, when Mr BMP is here. I think there was a dedicated thread for it in the TV section....? (which I am avoiding)
But the very brief synopsis I read, I don't think I know the case, which is unusual as I was following trials avidly for many years and always take a particular interest in juvenile crime. The second series, I recognised the case within about ten minutes. The first one I'd never heard of, despite it happening very close to where I now live!