Tempest [Destroyers Series, Book One]. Destroyers Series, #1

Lies, secrets, and a terrifying force within await Janelle in paradise. Moving to Florida should have been simple: start a new high school, make new friends, join the honor society, and make her strict father proud. But instead, she watches a mysterious boy materialize out of a dying hurricane. Gareth is cute, running from something, and has a spiral birthmark on his arm that matches Janelle's own.
And there's something dangerous about him she can't put her finger on. But Gareth isn't the only one who isn't normal. As strange things happen around Janelle and an ominous force stirs within, she needs answers her suddenly distant father won't give. Without a mother and betrayed by her father, her only desperate hope for the truth is Gareth. And it's horrifying. An unspeakable nightmare is screaming closer, and if Janelle doesn't escape, she'll kill innocent people.
Nothing will be sane or orderly again. For the first time in Janelle's life, she's breaking the rules. But running away might not be enough. Gareth is also fleeing, and those who pursue him also have their sights on Janelle.