Havoc is great in terms of sequels. It, unlike other books, does not ruin the first, nor does it go completely downhill. It continues the story of Seth, Kady, and that strange world of Malice. In this one, they decide set out to destroy the man Tall Jake, who controls the world. However, the book was a bit rushed. Seth and Kady are just discovering how to defeat Tall Jake, then, very quickly, at least it seemed like that to me, they were on the battlefield and ready to fight. I think the book should have been split into two; one could be about them finding what they need to win, the other about them fighting. There was one battle, then Tall Jake was defeated. There was no lead up or anything; one minute they were lost and looking for that oh-so-important weapon thing, the next they were blowing up Tall Jake's castle place. But I liked it; it was fun to read.
I would rate it a 3.5.