Childrens Russian books: Knight Caterino. Fantasy book for kids age 9 12 (Country of Frozen Time (Fantasy books for kids age 9 12))

The Sovereign was very old and would soon die. He needed an heir and ordered the magic swans to find him one. They found 7-year-old Gene who had just had a fight with his 11-year-old sister Kate. The idea of becoming a prince was so tempting that Gene agreed to go with the swans to the Country of Frozen Time. Now Kate, with the help of a feather left behind by the swans, must also travel there to bring her brother home.