Nick & Allie were in a fatal car accident and ended up caught in Everlost, a sort of limbo for kids who don't make it where they are going when they die. Everlost is a magical place for things and places that no longer survive in the living world (ex. the Twin Towers). But Everlost is also full of dangers (if the kids stay in one place for too long, they sink to the center of the earth), and monsters (the Magill, the Haunter). When Nick and Allie make it to the Twin Towers, they find Mary, who calls herself the queen of lost children. But while Nick feels at home with Mary, Allie suspects Mary is hiding something.
This is a fun young adult story with plenty of excitement and danger. The narrator did an excellent job and didn't distract from the story at all. This is an interesting look at what could happen to souls whose journey is interrupted. Many of the kids have been around for hundreds of years, including Mary, who has written books on how to survive in Everlost. The kids all cross over in whatever they were wearing, which makes for some interesting wardrobes and nicknames for those who may have died on Halloween or during a day at the beach (think Speedo). Nick even dies with chocolate on his face. However, if the kids don't think about things, they tend to forget them, such as their name and their physical appearance.
Bottom line: This is an engrossing start to the trilogy, that I will be happily continuing. The world building is remarkable and the ending suggests more peril and exploits for the characters that survive. Recommended to grades 6 & up. No serious violence and no sex, only cute crushes. Most of the kids we meet are under 16.