Pop of the Bumpy Mummy (The Notebook of Doom #6)

In this sixth book, Alexander's class goes on a field trip to the history museum. The students have been learning about the legend of the bumpy mummy in class. But then Alexander thinks he sees the REAL bumpy mummy walking around! The famous Ruby Scorpion gets stolen from the museum, too! And what are those strange popping noises?! Alexander and his friends will have to work fast to stop Stermont's latest monster!