Ada, Iggy, and Rosie are ready for the most super sleepover ever: They've got their sleeping bags, pajamas, a moon nightlight, and a dino-snore machine (well, that last one may not be perfect for the sleeping part of the sleepover!).

This will be Iggy's first sleepover at his house, so his dad helps brainstorm ideas for what to do at the sleepover. They can play games like ping-pong, eat yummy popcorn, and even tell spooky stories! They want to start with a game of ping-pong, but the ping-pong table is in the basement--and Iggy warns them that the basement is HAUNTED . . . or at least, he thinks it is. But he's never actually gone down there because it's too spooky.

It's up to the Questioneers to get to the bottom of if the basement is actually haunted by using the scientific method, their bravery, and a whole lot of teamwork.

Includes a Coloring Page to Tear Out and Display

Check out all the books in the Questioneers Series:

• The Questioneers Picture Book Series: Iggy Peck, Architect Rosie Revere, Engineer Ada Twist, Scientist Sofia Valdez, Future Prez Aaron Slater, Illustrator Lila Greer, Teacher of the Year
• The Questioneers Chapter Book Series: Rosie Revere and the Raucous Riveters Ada Twist and the Perilous Pants Iggy Peck and the Mysterious Mansion Sofia Valdez and the Vanishing Vote Ada Twist and the Disappearing Dogs Aaron Slater and the Sneaky Snake
• Questioneers: The Why Files Series: Exploring Flight! All About Plants! The Science of Baking Bug Bonanza! Rockin' Robots!
• Questioneers: Ada Twist, Scientist Series: Ghost Busted Show Me the Bunny Ada Twist, Scientist: Brainstorm Book 5-Minute Ada Twist, Scientist Stories
• The Questioneers Big Project Book Series: Iggy Peck's Big Project Book for Amazing Architects Rosie Revere's Big Project Book for Bold Engineers Ada Twist's Big Project Book for Stellar Scientists Sofia Valdez's Big Project Book for Awesome Activists Aaron Slater's Big Project Book for Astonishing Artists