Jannah Jewels - The Treasure of Timbuktu: Book 1

In their first book, a team of young Muslim women called the Jannah Jewels are brought to the ancient city of Timbuktu in Mali and meet the Treasure King. There they visit the Grand Mosque and University while trying to find the missing manuscript.
Who exactly is the Treasure King? And can the Jannah Jewels restore the missing manuscript before time runs out?