You Have to Stop This
By Pseudonymous Bosch
This book is mystery because the main character, Cass, has to figure out the Secret. Also, there are many mysteries of mummies, and the Secret.
So far, the book has taken place in Cass' home, her school, and at a museum. At the museum, Cass and her classmates went to many mummy exhibits.
Why did Cass' great-great-great grandmother and the Jester leave a lot of precious jewels and objects for her?
Did Dr. Amun (mummy) discover the Secret?
Why did Gloria Fortune Reality replace Grandpa Larry and Grandpa Wayne's antique store?