Seven-year-old Maddie Reyes can talk to Mom, Dad, and 14-year-old Sadina, her sister. But with the rest of the world—except for Bella, her robotic cat—she's too terrified to speak a word. Maddie wakes one night to find an intruder in the house, and now she's the only one who can identify him. Her friends join together to help transform Bella into Chattercat, a talking robot that just might get some answers from Maddie. Filled with beautiful watercolor illustrations, this captivating mystery, geared toward readers in grades 4 to 8, covers a range of important issues: friendship, teamwork, trust, making hard choices, and continuing to pursue goals, even in the face of overwhelming odds. With its key plot device involving artificial intelligence, the story contributes to student interest in STEM fields.