Synopsis

Earth is under attack from aliens, and our four time travellers must figure out how to stop enemies from a distant star system—before they even set foot on the planet. For the first time in their lives, the young adventurers attempt a quantum leap of thirty-nine light years, all while travelling tens of thousands of years into the past. In the process of fending off aggressive aliens, they also manage to save a faraway civilisation uncannily similar to our own.

When they finally return home, a worried teacher, Leho Anderson, is waiting—with grim news about Estonia’s future. Without hesitation, the travellers embark on yet another mission: to rescue both their homeland and the Earth itself from global climate change. Yet things turn out to be far trickier than expected, for even seasoned time travellers sometimes struggle to tell where their own world ends and a strange new one begins.