In the ninth book of the Alien Next Door series, Harris, Roxy, and Zeke have one more adventure at an marvelous alien museum before heading back to Earth! Harris, Roxy, and Zeke are hurtling back toward Earth after their adventure on Tragas. As they're playing games to fill the time, Zeke comes across a letter to his parents from the biggest, most famous museum in the galaxy. It's an invitation to an exhibit filled with research they did about Earth! Zeke begs his parents to go, and they decide there's enough time for one last stop on their trip before going back to Earth. Harris and Roxy are thrilled—what amazing things will they discover in this marvelous alien museum full of many galaxies' worth of wonders?