About the Book: When siblings Ava and Luke find a mysterious notebook in their dad’s attic, they uncover clues to a decades-old unsolved murder. Through diary entries, letters, and secret recordings, a chilling case unfolds before them. As they play detective, the mystery grows darker—and the killer may still be closer than they imagined. This gripping middle-grade mystery blends suspense, family secrets, and thrilling twists. Perfect for young readers who love detective stories and murder mysteries.