Dead Beautiful by Yvonne Woon

On the morning of her sixteenth birthday, Ren e Winters was still an ordinary girl. She spent her summers at the beach, had the perfect best friend, and had just started dating the cutest guy at school. No one she'd ever known had died. But all that changes when she finds her parents dead in the Redwood Forest, in what appears to be a strange double murder.

After the funeral Ren e's wealthy grandfather sends her to Gottfried Academy, a remote and mysterious boarding school in Maine, where she finds herself studying subjects like Philosophy, Latin, and the "Crude Sciences."

It's there that she meets Dante Berlin, a handsome and elusive boy to whom she feels inexplicably drawn. As they grow closer, unexplainable things begin to happen, but Ren e can't stop herself from falling in love. It's only when she discovers a dark tragedy in Gottfried's past that she begins to wonder if the Academy is everything it seems.