The United Middle School Mysteries Book 10 (Paperback) (ISBN-13: 9798231412969)

A missing painting. A field trip gone wrong. And two chaos-loving classmates who make everything worse-or maybe better.
When a priceless masterpiece vanishes during United Middle School's field trip to the Greenfield Museum, it's up to the Young Investigators-Jake, Emily, Max, and Amy-to crack the case. But with Chip and Mia causing mayhem, a fainting tour guide, secret passageways, and a barking morale officer named Rusty, solving this mystery might be their wildest adventure yet.
Can they find the stolen art before the buses leave... or will the real treasure be lost forever?