Eliot catches a boy dressed in black about to kiss his sister's friend Diane. In his imagination, Eliot thinks Diane has been bitten by a vampire! Bad luck - his sister Suzie has organised a party at the house with all her friends, including the boys dressed in black! There's no doubt, as far as Eliot is concerned, that it is a vampire ball. He has to find a way to combat these creatures of the night and stop Suzie from being bitten.