Shadow Walker — Raven Snow

Every three years like clockwork, on the first day of June, the Tribe rolls into town.
Skye McAdow knows his mother has a history with the caravan of peace-loving hippies who spend their summer at Pyramid Park, in the shadow of the cave known as Pharaoh's Tomb, but Solana McAdow has always been careful to keep Skye away from the Tribe. Until this summer, the summer Skye turns seventeen, because two years ago, Solana vanished in the middle of the night, leaving Skye and his little sister Willow to make their own way in the tiny town of Dry Spring.
The Tribe is not Skye's biggest worry. There is his Sight, for one thing. Nobody but Solana knows that Skye can See the future - and the past. Then there is Aunt Jenny, who has come to depend on Skye far too much since he moved out to the family farm; his Pa, who blows into town now and then, just long enough to use Skye as his personal punching bag; the Jock Club, led by the mayor's son Braden Tuttle, who seems to have it out for Skye; and Kit Crawford, the only boy cheerleader in Dry Spring, who rescues Skye from one of Pa's beatings on a spring night and suddenly appears in one of his Visions, in a future Skye cannot imagine.
But when the Tribe reaches out to Skye, he discovers that their carefree nomadic existence is a lie. The magic of Dry Spring, a place called Little Egypt, is what draws the Tribe back every three years to the old forest outside of town - a magic connected to the stories Skye's mother used to tell him about Alfheim, the Land of the Elves, and the seven Aldar gods, who once fought a war for control of the Creation Stones. Over the course of one incredible summer, Skye will learn about loyalty, love, revenge, power, sacrifice - and the choices that determine our futures, whether we are ready for them or not.