Just finished Bangkok 8 by John Burdett. Excellent book. It was a little bit weird to read because the protagonist spends some time around the Nana Entertainment Plaza on Soi 4 in Bangkok. My wife's family lived on Soi 4, less than a block from the Nana Entertainment Plaza, and still owns a house there (the only one on their little street that's still privately owned/not a "rent-by-the-hour" hotel. Soi 4 wasn't as red-light then as it now - heck, it wasn't as red light 14 years ago as it is now - but it was a rare case of knowing almost exactly what the author was describing.