The girl Alice found a toy ship at the dacha and sent her favorite dolls to sail. Everything would be fine, but the frog Prince fell in love with Jenny’s doll and, mistaking her for Thumbelina, kidnapped her! But Jenny is by no means a timid Thumbelina. All the frogs, chafers and moles will soon understand this and bitterly regret their mistake! Jenny's friends were very worried about her and secretly from Alice they went in search. Many adventures await them - after all, the doll ship will end up in a strange world on the Other Side of the River, where everything is subject to the laws of magic...