At the National Museum of American History, Eric, Dominique, Aday, and Josephine enlist the help of Gilbert Stuart, John Trumbull, and Thomas Jefferson to thwart a plan to turn the United States into a monarchy.

Fourth-grade genius Mal and his talking dog Chad shrink themselves to microscopic size and travel through time, but girls and the school bully present bigger challenges.

Science-loving Delia Bean is expecting to have a pretty boring summer vacation looking after her little brother. But when her Uncle Lyndon offers her an internship in his Earth Time Museum, everything begins to look a lot better!

"Charlie and August, the two cats that control the mechanical superhero dog, Sparks, are keeping the city safe. But when a second, evil Sparks shows up and starts causing trouble around town, everybody blames the real Sparks. Determined to prove that Sparks is still the hero everyone can count on, Charlie and August set out to uncover the shocking truth about who is responsible for all the chaos"--Provided by publisher.