One-line verdict: Kinda like Laurell K Hamilton's Anita Blake series without the gratuitous sex and requisite multiple-facet love entanglements. Friend for links to all six ebooks in second post.
(only covers for 5 books, lazy to find last. XD)
The lazy summary from fantasticfiction.co.uk - Sexy bounty hunter and witch Rachel Morgan prowls the dark streets of Cincinnati, keeping tabs on the vampires and other creatures of the supernatural who prey on the city's innocent and vulnerable inhabitants.
Book 1: Dead Witch Walking
Book 2: The Good, the Bad, and the Undead
It's a tough life for witch Rachel Morgan, sexy, independent bounty hunter, prowling the darkest shadows of downtown Cincinnati for criminal creatures of the night. She can handle the leather-clad vamps and even tangle with a cunning demon or two. But a serial killer who feeds on the experts in the most dangerous kind of black magic is definitely pressing the limits. Confronting an ancient, implacable evil is more than just child's play -- and this time, Rachel will be lucky to escape with her very soul.
Book 3: Every Which Way But Dead
There's no witch in Cincinnati tougher, sexier, or more screwed up than bounty hunter Rachel Morgan, who's already put her love life and her soul in dire jeopardy through her determined efforts to bring criminal night creatures to justice. Between "runs," she has her hands full fending off the attentions of her blood-drinking partner, keeping a deadly secret from her backup, and resisting a hot new vamp suitor. Rachel must also take a stand in the war that's raging in the city's underworld, since she helped put away its former vampire kingpin -- and made a deal with a powerful demon to do so that could cost her an eternity of pain, torment, and degradation. And now her dark "master" is coming to collect his due.
Book 4: A Fistful of Charms
Now a mortal lover who abandoned Rachel has returned, haunted by his secret past. And there are those who covet what Nick possesses -- savage beasts willing to destroy the Hollows and everyone in it if necessary. Forced to keep a low profile or eternally suffer the wrath of a vengeful demon, Rachel must nevertheless act quickly. For the pack is gathering for the first time in millennia to ravage and to rule. And suddenly more than Rachel's soul is at stake.
Book 5: For a Few Demons More
Bargaining with demons has left Rachel Morgan in constant danger of losing her soul. As if being famous in the underworld - for all the wrong reasons - and sharing her home with a vampire and her jealous girlfriend didn't make her vulnerable enough, one night Rachel finds demons ransacking her home with no fear of sanctified ground. They are searching for something they believe Rachel to possess - a danger that Rachel thought was well hidden and secret. But when the human morgue starts to fill up with partially-turned lupine women who have been brutally murdered, Rachel realises that someone else knows the Focus still exists and that she may have been betrayed
Book 6: The Outlaw Demon Wails
To save the lives of her friends, Rachel did the unthinkable: she willingly trafficked in forbidden demon magic. And now her sins are coming home to haunt her. As Rachel searches for the truth behind a terrifying murder, an even greater menace threatens, for the demon Algaliarept will stop at nothing to claim her, and the discovery of a shocking family secret throws Rachel's entire life into question. If she is ever to live free, Rachel must first walk willingly into the demonic ever-after in search of long-lost ancient knowledge. But when you dance with demons, you lay your soul on the line . . . and there are some lines that should never be crossed.