Hannah and Jake Vann-Wong live in the wackiest house on Caper Street, and life at number 9 is a blast - until the day a sold sign goes up on the house across the road. When the Cruellys move in, stuff begins to happen - funny stuff, weird stuff, and stuff that isn't funny at all. It's time to learn the Vann-Wong family's ancient secrets, unlock the vault and access special powers handed down from generation to generation to stop them. A transforming dog, a sister struggling to master shape-shifting, and a pile of gear with no instructions - what could possibly go wrong?