I think I saw the first episode of this and thought it was about America,but it is really a UK/London story.
It is based on the idea of deep cover police officers,a big topic in the UK a few years ago.
This is well acted and gripping but not very realistic.
You do need to pay attention while watching it.
If you like Good Cop,The Shadow Line or Luther you will like this
Review of Undercover
Undercover
(I) (2016)
I missed this when it was broadcast but it is very good.
16 May 2020
Warning: Spoilers