Riordan runs a solo law practice and takes on the types of cases that usually require him to moonlight as an effective, albeit somewhat reluctant, tough-guy troubleshooter. Although he is not strictly a criminal attorney, Riordan's cases all involve murder and other crimes. This brings him into regular contact with the Seattle Police Department and, in particular, a homicide lieutenant named Vince Ahlberg. Riordan earns his tough-guy reputation by frequently carrying a gun and using physical violence. If you have to prove it, you're not tough.
Tough guys are existential, too.
His use of local color and historical details beautifully and accurately describe Seattle and the Pacific Northwest region.