9 books in series

The Iron Druid Chronicles

The Iron Druid Chronicles is a 18-book series with 9 released primary works first released in 2010 with contributions by Kevin Hearne.

Grimoire of the Lamb
Clan Rathskeller
Kaibab Unbound
Hounded
Hexed
Hammered
A Test of Mettle
Tricked
Two Ravens and One Crow (The Iron Druid Chronicles, #4.5)
Carniepunk
The Chapel Perilous
Trapped
Hunted
Shattered
Staked
The Purloined Poodle
The Squirrel on the Train
Scourged