Challenges of Gobi Desert

This book is about two sisters reading in a library. After randomly selecting a book from the bookshelf, something scary but yet unbelievable happened the sisters were teleported to the Gobi Desert where they met a white figure. They were told that, to survive, they must undergo three challenges. One of the challenges is to win the battle against the Gobi worm. For the other challenges, the readers must find out for themselves. This book transports the readers to a magical but perilous world where two sisters learned a secret code that bestowed them with special powers and where they fought the most horrifying worm of all times. Will the sisters win over the Gobi Worm?