In a generous mood, I like the Stephen Leather/Spider Shepherd books, of which I have read several. I am not sure what made me buy this, probably a Facebook post. But I read it. The reason for generosity is that it starts pretty slow, the main character has no business being by himself on a murder investigation, let alone investigating a murder overseas, and then the ending was, so what happens to the new vice president? Probably should be 3.4 to 3.6 or so rating.
Nick Wright, his partner is Reid, they are always drinking on job. They are transportation police, investigating a murder. Someone else gets killed in Thailand in a similar fashion to the murder in London, and Wright talks his way into getting sent to see the connection. All of this could have been condensed, but was not great. Then Wright gets to Vietnam and goes searching for the murderer, while tailing others involved in the case through tunnels and that was pretty good reading.