Welcome to Hickory Hollow! The town may be tiny, but it is a special place for the people who live there. There is always fun and adventure to be had in Hickory Hollow. It's a great place to be a curious kid! There are important discoveries to be made, secret riddles to be solved, unexplained mysteries to be discovered, and even hidden treasures to be found. But watch out! Sometimes, the town seems to have a mind of its own.

Mateo Diaz loves history, especially when he gets to help out his abuela at the Hickory Hollow History Museum. When Mateo stumbles upon a riddle on a monument in Town Square, history becomes even more exciting. It seems like a former resident, the mysterious Ms. X, left a buried treasure somewhere in Hickory Hollow!

Mateo gathers his group of friends, and together, they embark on a grand treasure hunt around town. Every clue they find helps them learn more about Ms. X. But will Mateo and his friends be able to find Ms. X's treasure?