Piper, the sister, ends up working in a diner to pay for RV repairs; Zach meets a mysterious girl who is part of a society dealing with dark forces.
The three villains seem more like the comic relief in this follow-up story as Shadow Man uses the leader of the society, Jason, to capture Elijah.
Meanwhile, the parents are working on escaping from Shadow Man's lair.
This second book seemed a lot like Myer's earlier work called The Forbidden Door series which also dealt with dark spiritual warfare stuff.
Outside of the villains seeming too goofy and leaving the menacing for Shadow Man, this series is turning out to be a decent weekend read.