9 books in series

Nightside

Nightside is a 10-book series with 9 released primary works first released in 2003 with contributions by Simon R. Green.

Something from the Nightside
Agents of Light and Darkness
Nightingale's Lament
Hex and the City
Paths Not Taken (Nightside, #5)
Sharper Than a Serpent's Tooth
Hell to Pay
The Unnatural Inquirer
Just Another Judgement Day
The Good, the Bad, and the Uncanny
A Hard Day's Knight
The Bride Wore Black Leather
Night Fall