It's Treason, by George!
In the third graphic novel of the Secret Smithsonian Adventures series, our heroes visit the National Museum of American History and realize that someone is trying to turn America from a democracy into a monarchy. They must stop this plan to make a president into a king!
Claws and Effect
In the second graphic novel of the Secret Smithsonian Adventures series, our heroes intervene to save the National Museum of Natural History from villains who want to bring dinosaurs back to life--to make money!