
Hannah Green discovers that her grandfather works for the Devil. He used his singular skills as an engineer to create a machine that keeps evilness flowing out of Earth and into Hell, and when bad things threaten to destroy the machine, Hannah must help her grandfather battle the forces of evil and restore things to the way they should be. It’s a fun read – kind of young adulty and yet with some very dark themes and some quite scary and violent scenes. I liked it enough to buy another book by the same author.