From Emily Calandrelli—host of Xploration Outer Space, correspondent on Bill Nye Saves the World, and graduate of MIT—comes the second novel in a brand-new chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. Ada Lace is building a new robot! She's determined to beat Milton in the upcoming robotics competition. But she's distracted—Ada finds her dad's...