Klarissa Caruso has lived her life as the unwilling weapon of her father, Vincent Caruso-a man determined to wipe shifters from existence. Brilliant in virology but broken by years of abuse, she flees into the arms of fate and finds herself bound to twin tiger shifters Rune and Kamon, Elite Shifter Enforcers who recognize her instantly as their mate. But when Caruso launches a war on Chicago, kidnapping children and unleashing toxins Klarissa herself once created, she must decide if her atonement lies in sacrifice or survival. With her mates at her side and her brilliance as her weapon, Klarissa will either save the shifter world-or fall with it.