Zed Watson loves a few things: their name (which they chose themself!), their big rambunctious family, and--oh yeah--monsters. When Zed discovered the mystery surrounding an unpublished novel called The Monster's Castle, they were completely hooked. Now Zed is a member of a small but dedicated legion devoted to finding the long-buried text. When a breakthrough discovery leads Zed to the route that they are sure will take them to the treasure, they know it's time for a road trip. And with the help of their shy, flora-loving neighbour, Gabe, and his sister, Sam, a geologist who is driving back to college in Arizona, Zed and company are soon off on a wild adventure following cryptic clues.