Mom stayed on Mars, and dad urgently flew to Siberia. Eleven-year-old Lisa, along with her faithful robot Bobbe, goes to the Space Center of the Institute of Time to stay with her uncle and prepare for the concert: she will have to read Zabolotsky’s poetry. No one yet knows that a real sabotage is being prepared at the Institute... One fatal accident - and Lisa, together with a group of scientists, ends up on a completely unplanned expedition to the Permian period. The continents have unusual shapes, and dinosaurs have not even appeared yet. The concert is 290 million years away, but Lisa seriously risks not getting to it... Will someone else read Zabolotsky? The main character of the story is like the younger sister of the famous Alisa Selezneva, brave and resilient. The prospect of missing the concert scares her much more than unfamiliar amphibians and giant dragonflies. The forced time travelers must return safe and sound, leaving no traces in the ancient world, like the characters in Ray Bradbury's story "A Sound of Thunder." After all, they treat history with care, unlike those whose stupidity and self-confidence brought them here. The plans of these adventurers must be thwarted, and the expedition turns into a chase through millennia. Nikolai Ponomarev is an exceptionally versatile author: he succeeds in romantic young adult (“Bifurcation Point”), anti-war post-apocalypse (“City Without War”), and science fiction stories for younger readers. Fans of Kir Bulychev and other masters of children's fiction will appreciate the story “290 million years ago and beyond” at its true worth. Following the fascinating plot, the reader learns a lot about the flora and fauna of prehistoric times.