"With their last adventure just barely over, the Walker kids thought life would finally go back to normal. But things don’t remain calm for long... especially when the colossus Fat Jagger turns up in San Francisco Bay--and he’s in danger! With the police closing in, the Walkers must figure out how to save their giant friend. When a frost beast is spotted in Santa Rosa--and more mystical creatures start appearing all over America--it’s soon clear...