I've just finished London Falling, the latest book by Patrick Radden Keefe, an in-depth investigation of the death of a young man who falls from the balcony of a London block of flats into the Thames. I found it fascinating - it covers the impact of Russian oligarchs on the City, old time London gangsters, corruption at the Met and a bewildered family trying to figure out what happened to their son. Detailed research but so well told that its like reading a fictional thriller.
I have also read 2 of his previous books; Say Nothing about the Troubles (also a C4 TV series) and Empire of Pain about the Sackler family and the opioid crisis in the US. Both excellent books and worth a read.