Алиса Селезнева и Пашка Гераскин во время геологической практики отправляются на необитаемую планету Холмасто, в долину Семи Копыт. Задание Алисы состоит в поиске драгоценных камней, а Пашка должен найти полезные ископаемые. Вместе с детьми на Холмасто отправляется разумный кораблик Гай-до. И как хорошо, что Алиса и Пашка не одни, ведь планета заселена противными и мерзкими пауками-людоедами.
Kir Bulychev was a pen name of Igor Vsevolodovich Mozheiko, a Soviet Russian science fiction writer, critic, translator and historian of Lithuanian ancestry. His magnum opus is a children's science fiction series Alisa Selezneva, although most of his books are adult-oriented. His books were adapted for film, TV, and animation over 20 times – more than any other Russian science fiction author – and Bulychev himself wrote scripts for early adaptations. He began to write SF in 1965. He has translated numerous American SF stories into Russian. Winner of the ESFS Awards in 1984 as the "Best Short Story Writer". Winner of the Aelita award in 1997.