Follow along as BFFs Rose and Melanie solve another mystery. The two girls love finding cases to solve, so when a bag of marshmallows goes missing on a camping trip, they know this is a mystery they have to solve fast. Time is ticking before the clues disappear and they have to head home. Not a problem in Rose's mind, she is convinced her arch nemesis, a.k.a. her best friend's little brother, Jerry, is the culprit. Will she prove he did it, or will he keep his 'sweet little boy' cover intact until another day?