When Aunt Tabby and Uncle Drac head off to Transylvania, Araminta is upset—they're going to be away on her birthday. However, when it turns out that her almost-grown-up cousin, Mathilda, will be babysitting, it seems things couldn't get any better. But Mathilda's brought along trouble: two rowdy teenage ghosts, Ned and Jed, who listen to no one. It's a disaster! Can the girls figure out a way to get Ned and Jed out of the house for good?