Group projects can be tough, especially when you are paired up with your classroom rival. Third-grade inventor Ada Lace and her best friend Nina have spent hours building a highly complex, perfectly to-scale model of a historic silver mine for their new social studies teacher. The only problem is their third partner, Milton. Right before turning the diorama in, Milton cheerfully announces he added his own special touch to the project. Knowing Milton, Ada immediately panics and assumes he has completely sabotaged all their hard work. Desperate to fix whatever disaster he created before grading day, Ada and Nina hatch a daring plan to infiltrate the classroom after school. Pulling off a high-stakes supply closet heist will require every ounce of their combined technical genius and creative problem solving. You will be on the edge of your seat as the girls try to outsmart the school security system and pull off an impossible mission without getting caught.