The Witch's Blood

In this spellbinding finale to the acclaimed YA fantasy romance trilogy, a teenage witch must save her brother from her evil archrival.

Merry has finally learned to harness her powers. She's also gotten used to breaking the rules. So when the coven forbids her from rescuing her brother, Leo, she defies them, with terrifying consequences.
An evil sorcerer has abducted Leo and taken him to an alternate reality. To get him back, Merry will have to confront enemies from her past and present, and risk the lives of everyone she's ever loved. As her efforts cause more chaos, she will ultimately have to decide how much she's willing to sacrifice to make things right.