Mona is a ten year old girl who revels in the icky and eerie. When there's a ghoulish mystery to be solved she becomes Mona The Vampire! A new fitness centre opens in town and suddenly everyone is groaning and unable to work properly. Mona is suspicious and is convinced everyone's energy is being zapped by the Billabong Bunyip. Can she and her friends send the Bunyip packing, or are they about to become one of it's victims?