On a sunny afternoon in June, four of Mrs. Johnson's students- Blogger, Petal, Amira, and Billy- attend Forest School. Each child is asked to explore Forest School, discovering the fantastic creatures living in this outside environment. When they return to the willow circle to compare notes, Petal realizes her precious locket has gone missing.
Together, they undertake a frantic search, but because of the time, Mrs. Johnson has to call off the hunt. Petal's grandmother gave her that locket right before she died, so Petal refuses to give up and so do her faithful classmates. They have no idea the magic that's about to occur.
Secretly, their teacher Mrs. Johnson is Kayla, the Good Witch of all Forest Schools. Kayla transports the four children to a different dimension where they enlist the help of a mystical grasshopper named Dylan. The kids have two days to find the locket and return home. If they're late, they'll be trapped in a different dimension forever!
