Book 1

Hellraisers

by Alexander Gordon Smith

Published 1 December 2015
Marlow Green is a high school boy in New York who is always in trouble for vandalism and acting out, until one day he stumbles into the middle of a battle with a demon, and learns about The Devil's engine--an ancient machine which can grant anything you wish for, in exchange for your soul.

Book 2

Devil's Engine

by Alexander Gordon Smith

Published 1 November 2016
"Fifteen-year-old Marlow understands that their former leader must be stopped from using the two Devil's Engines in his control to open the gates of hell--something Boyd cannot do until he discovers the location of a mythical third machine. Marlow and Pan must take up this deadly duel with an all-powerful enemy that seems utterly impossible to win"--

Book 3

Hellwalkers

by Alexander Gordon Smith

Published 7 November 2017

Book 3

Devil's Engine

by Alexander Gordon Smith

Published 7 November 2017
After Marlow makes a deal with the Devil to get himself and Pan released from Hell, war breaks out and the friends have only each other, and hope, to combat demonic creatures and monsters.