Broken by Kelley Armstrong (480 pgs) 2006 (Women of the Otherworld #6)
This latest entry returns the focus to Elena, the werewolf who began the series. She takes a seemingly simple job stealing a letter supposedly written by Jack the Ripper. Things turn quickly when a drop of blood opens a portal. A couple of murdering zombies fall out, as well as various plagues from the Ripper’s time. It’s up to Elena and her pack to piece things back together and close the portal before the rest of hell breaks loose.