After visiting the planet Uxu, Alisa Selezneva learns a sad news: the overthrown dictator Uxu-Ba took away the beloved landmark of the inhabitants—a children’s railway. Alisa decides to help the Uxuians… (“A Planet for Tyrants”).
The space ship “Smile” is swallowed by a small star dragon. Alisa, along with her grandmother Lucrezia, rushes to the rescue. The ship is saved, but Alisa faces a new mystery—a black stone with clearly biological structure… (“The Secret of the Black Stone”).