While on a field trip to Bokati Island with the mysterious Guardian Master Em, Plum must decide whether or not to reveal her own Guardian powers when an unseen force puts the entire ecosystem at risk.

"Young Plum is shocked to discover that she's been accepted to the Guardian Academy on Lotus Island, an elite school where kids learn how to transform into Guardians, magical creatures who are sworn to protect the natural world. The Guardian masters teach Plum and her friends how to communicate with animals and how to use meditation to strengthen their minds and bodies. All the kids also learn to fight, so they can protect the defenseless if needed....