The Gatehouse Code brings the Maple Ridge Inheritance series to its most suspenseful chapter yet, weaving together hidden jewels, digital clues, and a mystery that reaches all the way back to the old Frayne estate. When Tessa Morgan, Harper Hartford, and Benny stumble upon a faceted diamond buried beneath the floor of the Hartfords’ abandoned stone gatehouse, summer transforms instantly from chores and crabapple trees into a high-stakes investigation. Rumors of jewel heists have been buzzing across the Hudson Valley for weeks, and the timing is too perfect to ignore. Harper’s family has just hired new staff—people no one in Riverview knows—and the mansion’s security cameras keep glitching at suspicious hours. With the adults distracted and the police too far removed from the truth, Tessa forms the Trailblazers of Riverview, a secret team determined to uncover who hid the diamond and why. Brian and Mart join the mission, bringing tech skills, trail cams, and a knack for digging into digital footprints. Harper taps into the mansion’s security system, uncovering late-night movements and corrupted footage that point toward someone with access—and a reason to hide their tracks. Benny, eager and fearless, becomes the team’s eyes on the ground. Their search leads them back to the abandoned Frayne Victorian, where Jake Grayson once hid from his stepfather and where new evidence suggests someone else may be using the house’s blind spots. As the Trailblazers map the attic, decode old papers, and plant cameras around the property, they begin to see a pattern: the diamond is only the beginning. Someone has been using Riverview’s forgotten corners to stash stolen jewels, and the gatehouse discovery has put the kids directly in the path of a thief who doesn’t know they’re watching. With rising tension, shifting alliances, and a mystery that ties together the Frayne legacy, the Hartford mansion, and the jewel heists gripping the valley, The Gatehouse Code delivers a thrilling, heartfelt adventure about courage, teamwork, and the power of young investigators who refuse to look away. Perfect for readers who love clever middle‑grade mysteries, found‑family dynamics, and stories where ordinary kids uncover extraordinary secrets.