Lu Yang 
Xiaolong Expedition Team. The Golden Mask of Mummy [EPUB ebook] 

Qin Xiaolong, a kind-hearted and strong martial artist, met an old beggar on his way home from school. He was being bullied by a group of gangsters. Qin Xiaolong defeated the gangster and bought food for the old beggar. The old beggar was so moved that he stuffed him a brick, saying it was a gift to thank him. By chance, Qin Xiaolong discovered that there were seven sheepskin scrolls hidden in the blue bricks. He called four friends to study the seven parchment scrolls together and found that they concealed the secrets of the seven wonders of the world»s civilizations. So, five elementary school students with unique skills decided to form an "Xiaolong Expedition Team" and use the summer vacation to explore the secrets behind these wonders.