Finding Destiny - Unexpected Magic, #4

Family ties can heal the past. Or drag you straight to hell. Isaac Zamora, my significant other and a talented user of magic, insists I'm a powerful witch. But when my bio-grandmother sends demons to kidnap me to her monstrosity of a Victorian house in Boulder, I can't exactly fight back. Against Virginia Powers, who's been wielding the dark arts since before I was born, there's no point. I need a plan.
Someone who uses that much magical Botox has a blind spot somewhere, and I intend to find it. But she finds mine first - a half-sister named Destiny. I've always longed for a sister, someone with a connection to the mother who died so young. But not if it means giving up my freedom. Like the objects my lodestone ability brings to me, that connection seems to draw the truth out of gentle, seemingly innocent Destiny - Virginia's secret plan to summon the prince of Hell.
Our grandfather. This revelation answers so many questions, and gives me a valuable tool to foil good ol' grandma. But once Isaac learns the truth about my demon blood, the love we've slowly, carefully nurtured over time could go up in flames.. Note: Finding Destiny is the fourth and final book in USA Today bestselling author Christine Pope's "Unexpected Magic" series.