I just finished Knots and Crosses by Ian Rankin.

Knots and Crosses is set in Edinburgh, like the 44 Scotland Street series I like so much but provides a very contrasting view of the city.  It is a mystery, of the serial killer/police procedural variety, starring the very depressed and disturbed Inspector Rebus.  Rebus is an SAS veteran who left it under mysterious circumstances and forced his way onto the police force.  He gets more closely involved in a serial killer investigation that ends up being tied to his personal life.

In general, it provides a much seedier view of Edinburgh, focusing on the poor, the perverted and the drug addled.

I expected more from this book, given that it spawned one of the most successful series of mysteries in the UK.