In a small town, a curious boy named Lee discovers an old map leading to hidden treasure. Joined by his best friend Max, they embark on an adventure, solving clues that take them to various landmarks. Their journey includes unlocking a compartment in an ancient oak tree, deciphering a riddle at the old mill, and ultimately finding a hidden box in the park. Instead of gold, the treasure contains a diary and locket belonging to a beloved grandmother. They donate these precious items to the town museum, celebrating a newfound piece of their town's history and leaving a legacy of their adventurous spirit.