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An imaginary world comes to life in a holiday tale of an eccentric toymaker, his adventurous granddaughter, and a magical invention that has the power to change their lives forever.

Heidi is orphaned and her uncaring maternal Aunt Dete takes her to the mountains to live with her reclusive, grumpy paternal grandfather, Adolph Kramer. Heidi brings her grandfather back into mountain society through her sweet ways and sheer love. When Dete later returns and steals Heidi away to become the companion of a rich man's wheelchair-bound daughter, the grandfather is heartsick to discover his little girl missing and immediately sets out to get her back.

Kevin, Nick, and Joe Jonas face a series of escalating obstacles as they struggle to make it from London to New York in time to spend Christmas with their families.