LAPD robbery-homicide detective Hayden Glass has always had trouble controlling his urges. No longer trolling the streets looking for working girls, he has a new obsession--the Internet. Infatuated with a woman he finds on a web-site, Hayden Glass's sex addiction drags him to San Francisco and into a web of corruption and crime. Glass's search for this woman leads him to a massive sex slave trade run by the Russian mafia and protected by a group of powerful and corrupt San Francisco cops. Glass gets co-opted by the FBI to aid in their investigation ... but his presence is doing much more harm than good.
Severity reflects intensity, not value — “central theme” means a warning is a core part of the book, not that the book is bad.