Lulu has put her tantrum-throwing days behind her. That is, until her parents announce that they're going on vacation — without Lulu! Not only that, but they're leaving her with the formidable Ms. Sonia Sofia Solinsky, who has the kind of smile that an alligator might give before eating you for dinner. The second her parents are out of the house, Lulu tries out several elaborate schemes to bring them straight back. But just when she seems to finally be making some headway, her babysitter reveals an astonishing secret, one that has Lulu crossing her fingers that her parents will go on vacation all the time without her!