Like its predecessor, Everwild is slow-moving, but picks up in the last third. In a book that's over 400 pages, that's quite a lot of reading before you get to the good stuff.
There's a large cast of characters in this series, and a few notables join the cast in this second book, but Shusterman manages to make each character distinguishable. Mary Hightower sinks to new depths in this one, and manages to find a sociopathic skinjacker for a partner. She's an interesting character for a children's series - a villain who believes deeply in the righteousness of her cause, able to sway many because of her beauty and ability to deceive. She's like Lucifer and Glinda the Good rolled into one.
In this book, more mysteries of Everlost are revealed, some of which seem like little more than convenient plot devices. (spoiler removed)
For all the sluggish pace in the first half of the book, Shusterman does know how to write a climax that's also a cliffhanger, and leave you curious for what happens next. I just wish more of the story was as good as the last ten chapters.
See my reviews of Everlost (Skinjacker #1) and Everfound (Skinjacker #3)