When Ada, Iggy, and Rosie have a sleepover at Iggy's house, they want to start with a game of ping-pong in the basement, but Iggy warns that the basement may be haunted.
"Join Ada Twist, Scientist and her friends Rosie Revere, Engineer and Iggy Peck, Architect as they ask big questions and work together to discover more about their world"--Back cover.
