So mom has clearly told the kids, big sister MaPetite and twins Simon and Schuster, not to go into the woods. Especially to avoid the Cave de Nez, Nose Cave in Nose Mountain. And to watch out for the Big Booger who lives in the cave. So what will the boys do? Go into the cave and drag their sister and pet Dino in with them, of course. To meet the terrifying Big Booger. Or was that what he really is?