A string of bad accidents has plagued the Canute storm-chasing team, who are competing in the Green Skies competition. Nancy Drew is sent to the team by P.G. Krolmeister to investigate. She becomes the team intern, replacing the previous intern, Pete, who broke his leg in the latest of the accidents. Nancy has to keep her wits about her, as not only does she have to expose a saboteur, but also is in danger from the powerful storms.