Bunny Starch, the most feared biology teacher ever, is missing. She disappeared after a school field trip to Black Vine Swamp. And, to be honest, the kids in her class are relieved. But when the principal tries to tell the students that Mrs. Starch has been called away on a "family emergency," Nick and Marta just don't buy it. No, they figure the class delinquent, Smoke, has something to do with her disappearance.