Steve Brezenoff 
Case of the Missing Museum Archives [PDF ebook] 

When the plans for the prototype of a failed flying machine go missing from the Air and Space Museum’s archives, Amal’s father, the assistant archivist, is blamed. No one suspects a crime has been committed — except Amal and her friends. With her father’s job on the line, it’s up to them to track down the missing plans and get to the bottom of the museum mystery.