"A British homicide detective investigates a murder in a German-occupied England in a parallel universe where the Nazis won World War II." IMDb
Based on the 1978 book of the same name by Len Deighton the story revolves around Superintendent Douglas Archer (Sam Riley) investigation of a man found shot dead. Also featuring James Cosmo as Harry Woods, Rainer Bock as Fritz Kellerman.
The murder investigation then starts to get odd when very senior German SS officers start joining the (what should be a simple murder) investigation. The body also has some strange injuries to it.
Not going to give too much away.
The series has got a very authentic look to it, and a lot of the details seem right for the period, it's a little on the gloomvision side (being quite dark) and a number of viewers have complained of poor sound as theres a lot of quiet talking, I had no problems but I am listening to it with headphones (my usual system) maybe with speakers there might be an issue.
Waynes rating 6.5/10 Looks promising but I've only seen the first episode, it might get a higher rating as it goes on.