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On a bird-watching expedition, Hilda, Frida and David run into meteorologist Victoria Van Gale, whose calm new life makes one of them very suspicious.
David confronts his many fears when he stumbles into a ferocious battle during an overnight Sparrow Scouts camping trip with Hilda and Frida.
Chaos comes to Trolberg when the bell system begins to ring every hour, inspiring Hilda and friends to hatch an elaborate scheme to quiet the noise.
From a terrible two-headed troll to a tower full of witches, Hilda finds adventure, magic and trouble in Trolberg and beyond with pals Frida and David.