Three people, three different backgrounds and lifestyles, one soft drink. It's a thriller, and so well written. This book flew by, because the writing was crisp, but not spare, the characters not at all stereotypical (there's plenty of backstory).
But what I liked most was the choices Rupert Thomson makes in his descriptions - he doesn't show you everything, only just enough so the reader has to do a bit of work.
This book's well worth your time, if you like a literate and somewhat scathing noirish read.