The 2nd book in the series The Time Explorers.

The impossible was about to happen again. Most scientists said that TIME TRAVEL was impossible. The bolder ones thought that, theoretically, it might be possible to create a tear in the fabric of SPACE-TIME to take a peek at another moment in history. However, everyone absolutely agreed that it would never, ever, ever be possible to visit another era. And yet...!

Professor Cleverthes is leading the most important scientific project in history! Christina, Victor, Miguel, ibis, and Kali – the bird-dinosaur – will travel back in time to collect items from the most exciting ancient civilizations. But the evil Malephico Durador, the Professor's sworn enemy, will turn every mission into a very dangerous adventure!

Come on, with a clock you too will travel to the past… The Time Explorers will travel to Iceland in 980, during the Viking era! This time they must obtain a silver buckle that King Harald II of Norway gave to Erik the Red, the explorer who founded the first Viking settlement in Greenland. But Malephico Durador will try to stop them once again with his tricks…

Each book allows us to enjoy an exciting journey through time with Victor, Christina, ibis, and Kali. Readers will find some questions that enable them to discover historical curiosities about ancient civilizations. To do this, they will need to use the hourglass included in the book to decipher the page number hidden behind a red background, allowing them to travel through time to uncover incredible historical events.