Chaos and mayhem reign as Izzy and her friends take on another hilarious (mis)adventure. Izzy and her friends overhear their head teacher talking about "missing treasure" and "running out of time". They know this means there's TREASURE buried in the school somewhere and that Mr Graves wants it all for himself.
Izzy and her friends are puzzled by the weird noises coming from the school basement. It can't be growling, can it? But it's when Gary Petrie's cat comes back with video footage that they KNOW!
There's a BEAST in the basement AND IT WANTS TO EAT THEM ALL!