Explorers on Witch Mountain : The Polar Bear Explorers' Club, Book 2 (The Polar Bear Explorers' Club‪)‬

Stella Starflake Pearl is eagerly anticipating her next expedition. Suddenly disaster strikes when Stella's father, Felix, is snatched by a fearsome witch. Stella must bring her magic ice princess tiara to Witch Mountain or she will never see Felix again! But no one ever returns from Witch Mountain... Stella, Ethan, Shay, Beanie and reluctant Jungle Cat explorer, Percival, set off into the unknown. They will face terrifying bat caves, poisonous apple groves, outraged vultures, argumentative mushrooms and deranged broomsticks in their quest to rescue Felix.