This book is about a boy named Jasper Dash who goes to Delaware to stop evil villains who are taking over an ancient city which nobody can find except for brainy kids. It is called Vbngoom (Vih-Bin-Goom). My favorite part is when Jasper fights a grass squid that is 10 times the size of him. He doesn't have any weapons so he tricks the squid by running around its tentacles. The tentacles slash at him, but they miss and hit a lava pit.
If you want to learn more about the book, read it or listen to the audiobook at your local library. It is a fascinating book!