A Snake in the Grass — K.A. Stewart

Jesse James Dawson never wanted to find himself in the middle of a demonic war. However, with the addition of 275 extra souls to his life, he's got a target painted on his back in the most literal sense. With his apprentice, Estéban Perez, in tow, he heads to Mexico where the boy's mother, a powerful bruja, will hopefully be able to extract the souls without harm to any party involved. Champions for generations, the Perez family knows all there is to know about magic and taking out demons. But, like every family, there is drama bubbling beneath the surface. Add to that an ancient evil that has been waiting for just this chance, and of course, things are all going straight to Hell.