Ruined (The Eternal Balance Book 1)

Hell is looking for a way to break loose...

Jax lost the genetic lottery. Descended from Cain, the world's first murderer, he's plagued by a curse that demands violence in exchange for his happiness. He left everything behind, including the girl he loved, but thriving on the pain of others is lonely... And it's killing him.

After a series of heartbreaking losses, Samantha put rubber to pavement and headed for college as fast as her clunker could carry her. But she can't outrun her problems. When an attack at school drives her back home, she's thrown into the path of a past--and a guy--she's been trying to forget.
Sam strains Jax's control over his darkness, but running isn't an option this time. Someone--or,　something--followed her home from school: a ruthless monster with a twisted plan centuries in the making. Forced together to survive, and fighting an attraction that could destroy them both, Jax and Sam must stop a killer bent on revenge.