An Emerald Sky

After the battle of Al-Shaam - where the invading jinn army was defeated - Khadija, Jacob and their friends are heroes. Then, Khadija receives a letter: her sister, Talia, has been kidnapped and stolen into the magical realm of Al-Ghaib.
Accompanied by Darian - who has been different since jinniya Queen Bidhukh's parting blow - Khadija embarks on a quest to rescue Talia.
But Al-Ghaib, where the sky is emerald green, is a place of trickery: Khadija will have to have all her wits about her if she's to outfox her sister's captor…