The Darkest Hour (2014) novel: if Germany had won World War 2

Finished an absorbing first novel by British author Tony Schumacher called The Darkest Hour (2014). It's an alternate history where Germany won World War 2 and occupied much of England, including London. Set in 1946 in London, the work is very dark but compelling. It follows a former police sergeant and war hero, John Henry Rossett, who's being used by the Germans to round up Jews and deport them to the Continent. I thought I had the ending figured out, but I got fooled along the way as the novel took a different turn than I expected. Highly recommended for anyone into alternate  histories. This one also has movie all over it.