Firespell by Chloe Neill (book one)

Lily is being shipped off to a Chicago boarding school while her parents take a sabbatical in Germany. Immediately she makes friends with Scout, who leaves in the middle of the night on mysterious errands. After following her one night, Lily starts to learn the truth about her new friend, her parents, and herself.

Easy read. I loved the idea of these group of students saving the world, but underground. It has an interesting take on the magical community, still pitting good against evil. But the perspective of magic being a short term gift that is given back to the universe is a unique one.