From amazon.com:

HARRY DRESDEN WIZARD Lost items found. Paranormal Investigations. Consulting. Advice. Reasonable Rates. No Love Potions, Endless Purses, or Other Entertainment
Harry Blackstone Copperfield Dresden has had a rough couple of weeks. As the only openly practicing professional wizard in the Chicago area, he has squared off against a multitude of supernatural bad guys. Harry has won the day against demons, poltergeists, sorcerers, trolls, vampires, werewolves, and even an evil faerie godmother. You might think nothing could spook him. You would be wrong.
Something is stirring up angry apparitions all over town. Something that can break all the laws of supernatural physics. Something that doesnt like Harry.
His closest friends are being targeted. The net is closing in. Harry must find a solution soon or find this is one Nightmare from which he will never waken.
Buzzy Multimedia - Excellence in Science Ficiton and Fantasy Audiobooks

Lost items found.  Paranormal Investigations.
Consulting.  Advice.  Reasonable rates.
No Love Potions, Endless Purses, or
Other Entertainment.

Harry Dresden's faced some pretty terrifying foes during his career.  Giant scorpions.  Oversexed vampires.  Psychotic werewolves.  It comes with the territory when you're the only professional wizard in the Chicago area phone book.

But in all Harry's years of supernatural sleuthing, he's never faced anything like this: the spirit world's gone loco.  All over Chicago, ghosts are causing trouble - and not just the door-slamming, boo-shouting variety.  These ghosts are tormented, violent, and deadly.  Someone - or something - is purposely stirring them up to wreak havoc.  But why?  And why do so many of the victims have ties to Harry?  If Harry doesn't figure it out soon, he could wind up a ghost himself...

'Action packed page-turners.'
Starburst