In book 4 of this hit series, a giant volcano grows up out of the floor of Eerie Elementary!

Eerie Elementary is having a science fair. Sam, Antonio, and Lucy are hard at work on their projects when they find a strange, old book. Suddenly, the school comes alive! The ground shakes, science projects explode, and the school gym turns into a giant volcano! How will Sam and his friends fight hot lava? And what is hidden in that strange, old book?