Elinor Wonders Why: A Wonderful Journey

Elinor and her friends have a curious and fun adventure when they go camping with Ranger Rabbit to Hidden Lake, a place in the forest that they've never been to. On their wonderful journey, they bump into Bianca, an inventor and good friend of Ranger Rabbit's who studies frogs. But, on a hike to help Bianca observe them, the kids discover that the frogs seem to be missing from the lake. Why?