I know this has been pretty polarising but I really liked it. Very satisfied with the killer since I'd started to worry it might be some random character introduced late in the series and it gave Harry Lloyd a chance to channel his inner Viserys
I also liked the explanation that Grace was the prime target and the others were just killed to hide that and to frame Matthew since they all had links to him.
That said, I'm still confused on some things. Why did Henry kill the taxi driver and what happened to his brother? And was Bendik's death really just an accident after all?
But yeah, those loose ends aside I liked this a lot.