24 books in series

The Hollows

The Hollows is a 23-book series with 24 primary works first released in 2004 with contributions by Kim Harrison and Lisa Unger.

The Turn
Blood Work: An Original Hollows Graphic Novel
Blood Crime
Blutmagie
Dead Witch Walking
The Good, the Bad, and the Undead
Dead Witches Tell No Tales
Crazy Love You
For a Few Demons More
The Outlaw Demon Wails
White Witch, Black Curse
Black Magic Sanction
The Hollows Insider
A Perfect Blood
Into the Woods
Trouble on Reserve
Ever After
The Undead Pool
The Witch with No Name
American Demon
Million Dollar Demon
Trouble with the Cursed
Demons of Good and Evil
Demon's Bluff