Wolf Rising by JJ King

An unimaginable enemy, an awakened power, and three hot guys to drive her crazy.
Lexi’s life is out of control. Torn apart from one another in the heat of battle, Lexi and her mates unleashed something powerful and deadly.
She should be happy. The rescue mission was a success. Except Lexi can’t see beyond the horror they discovered. What they’d thought was a small army of vengeful boys is more massive than any of them can comprehend, a brotherhood that spans their entire world. They’ll need something powerful to fight back against a faceless and unknowable enemy.
But their power is unstable and the danger too vast. They saved lives but ended others. Will Lexi, Dimitri, Lucian, and Chase learn to control the magic inside them in time to save the world from The Brotherhood and their plans for global domination?