In reading order
Histories
John G. Hartness
Quincy Harker, Demon Hunter - Omnibus Volume One
John G. Hartness
Raising Hell
John G. Hartness
Year One
John G. Hartness
Straight to Hell
John G. Hartness
Hell on Heels
John G. Hartness
Hell Freezes Over
John G. Hartness
The Cambion Cycle
John G. Hartness
Heaven Sent
John G. Hartness
Heaven's Door
John G. Hartness
Heaven Help Us
John G. Hartness
Heaven Can Wait
John G. Hartness
Damnation
John G. Hartness
Calling All Angels: A Shadow Council Case Files Novella
John G. Hartness
Reaper
John G. Hartness
Devil Inside: A Quincy Harker, Demon Hunter Novella
John G. Hartness
Angel Dance: A Shadow Council Case Files Novella
John G. Hartness
Running with the Devil
John G. Hartness
Carl Perkins’ Cadillac
John G. Hartness
Inflection Point
John G. Hartness
Conspiracy Theory
John G. Hartness
Comes A Reckoning
John G. Hartness
Lost
John G. Hartness