Nancy Drew And The Clue Crew #1: Small Volcanoes

8 year old Nancy Drew decides to build a model of a volcano for her science project. Best friends George (Georgia) Fayne and a gungho Bess Marvin arrive to help. But, the next day, their teacher Mrs Ramirez opens the door to find all the volcanoes missing. Why are they missing? Is it an actual crime or a prank? And who did it?