Amelia is back to share the most unforgettable embarrassing field trip where her weird, annoying, and horrible big sister, Cleo, is the chaperone! What could be worse? When Mrs. O'Neill announces the 6th Grade Field Trip to the Nature Preserve, Amelia thinks middle school is the best! Then she discovers that her sister, Cleo, is going too. Talk about embarrassing! Amelia tries to miss the bus and pretends to be sick but neither plan works. So off to nature with Cleo and the entire 6th grade. Could this trip show Amelia a new side of Cleo that isn't as bad as she thought? Does Cleo even have another side? How will Amelia ever survive the embarrassment of it all?