Drummond-Sparks Escapades

Soon-to-be fifth graders, Paul Drummond and Billy Sparks' summer vacation at the beach with Lige Drummond, Paul's grandfather, is interrupted, when Lige's best friend Jess Hubbard disappears, and the boys are off to find him in Shumbus, a strange land deep within the Earth.

Things did not stay peaceful long in Shumbus after Paul and Billy's summer adventure there. The Critches are out for revenge. The Golden Mushroom is in danger and so is the very city where the Shumians have lived forever. With Jess Hubbard planning to help the Critches, they are sure to succeed unless Paul, Billy, and Argo can come up with something fast!