Darkness — Erika Knudsen

Mackenzie Sinclair has always been different.
Born a medium, he has survived attacks from malevolent spirits and unbearable heartache. In the course of his suffering, he discovered that he isn't alone. Mac was introduced to a secret society, the Azamaté, where he learned to hone his gifts by way of magick. Through them, he also uncovered a long lost family member, Josef Addams, who possessed his own powerful ability -- necromancy.
Just when life settled into a pleasant routine for Mackenzie and Josef, their world was upturned and everything wasn't as it seemed. Unknown to them, their power beckoned to a coercive spirit that neither had encountered before.
With things spinning out of his control, Josef is forced to embrace his ability. If he doesn't, Mackenzie will face a fate worse than death.