Eleven-year-old Hania has to find herself in a completely new environment after moving to another town with her dad. When the girls from her class take away her locket – a priceless family heirloom – Hania decides to get it back at all costs. In order to do so, she has to prove the existence of gnomes, in which – despite her age and the teasing of her peers – she still firmly believes. In her adventurous mission, she is helped – reluctantly at first – by her friend Michał, a young inventor. But it turns out that finding a magical creature is only the beginning. You still have to gain its trust and… learn to cooperate.