Hellfighters [Devil's engine Volume: bk. 2]by Smith, Alexander Gordon 

BTSB Prebound(Farrar Straus and Giroux, 2016)

BTSB #: 827264 Available

Dewey: FAges: 13-18   
AR: 5.4 UG RC: 5.6 9-12 Lexile: 760 HL

Genres: Scary/Horror Stories Science Fiction

Subjects: Science fiction Demonology - Fiction Monsters - Fiction Horror fiction

Summary: [2nd in the series] 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.

Hellraisers [Devil's engine Volume: bk. 1]by Smith, Alexander Gordon 

BTSB Prebound(Farrar Straus Giroux, 2015)

BTSB #: 827281 Available

Dewey: FAges: 13-18   
AR: 5.5 UG Lexile: 810

Genres: Supernatural

Subjects: Science fiction Demonology - Fiction Monsters - Fiction High schools - Fiction School stories Adventure fiction New York (N.Y.) - Fiction

Summary: [1st in the series] 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.

Hellwalkers [Devil's engine Volume: bk. 3]by Smith, Alexander Gordon 

BTSB Prebound(Farrar Straus Giroux, 2017)

BTSB #: 827267 Available

Dewey: FAges: 13-18   
AR: 5.8 UG RC: 5.3 9-12 Lexile: 810

Genres: Supernatural Science Fiction

Subjects: Science fiction Demonology - Fiction Monsters - Fiction Hell - Fiction Horror fiction

Summary: [3rd in the series] 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.