WATERS OF NYR by Terrie Leigh Relf

Cassandra and Baron are just ordinary teenagers when they meet in a community college art class and discover that they have a lot in common. They both live with their grandmothers, move around a lot, and experience strange dreams and inklings.
 
Could they both be in the Witness Protection Program, too?
 
It doesn’t take long for Cassandra and Baron to discover that there are no coincidences—and they are far from ordinary. They barely escape being abducted by shapeshifters, their grandmothers go missing, and a mysterious group of men appear to whisk them away to safety—aboard a starslip to another galaxy. 
 
But what—or who—are they being protected from, and what is this destiny that their grandmothers always hinted at but never quite revealed? 
 
From the moons of Mahrain, to the beacon lights of Ranat and beyond, Cassandra and Baron struggle with knowing whom to trust—especially when their own uncle conspires to use them for a heinous purpose. 
 
For only they can unleash the Waters of Nyr.