Sandstorm. Tales of Tavamara, #2

Stories are told of the wild Tribes who control the untamable Desert, the bloody battles that are waged there, but little is actually known. In a place where alliances are as shifting as the sands, one Tribe is universally regarded as the most dangerous: the Ghost Tribe, led by the bloodthirsty Sheik Hashim and his son Sahayl, called the Sandstorm. Sahayl is not his father, however, and would rather see the Tribes find a way to live peacefully.
When a meeting to negotiate peace with the Falcon Tribe goes wrong, nobody is more disappointed than Sahayl, especially as it means he'll never come to better know the beautiful, blue-eyed Falcon who challenged him. Then the violence in the Desert abruptly worsens as Tribes believed long dead begin to appear, and sorting ally from enemy becomes impossible. To save his Tribe and the Desert, Sahayl must take drastic measures that will reshape the Desert in a way that only a Sandstorm can...