Luminous By Mara Rutherford

(new, hardcover)
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Liora has spent her life in hiding, knowing discovery could mean falling prey to the king's warlock, Darius, who uses mages' magic to grow his own power. But when her worst nightmare comes to pass, Darius doesn't take her. Instead, he demands that her younger sister return to the capital with him. To make matters worse, Evran, Liora's childhood friend and the only one who knows her secret, goes missing following Darius's visit, leaving her without anyone to turn to.

To find Evran and to save her sister, Liora must embrace the power she has always feared. But the greatest danger she'll face is yet to come, for Darius has plans in motion that will cause the world to fall into chaos--and Liora and Evran may be the only ones who can stop him.