Spider shifter Sienna Haze is a dominant and sensual woman who believes all subs should be treated with a firm hand. However, when her mate catches her with another woman and walks out on her, she lets her leave. Eight months later, Kallie Checkwing returns to Sensation after her mother's death and finds herself as drawn to Sienna as ever. Wary, she tries to keep as much distance between them as possible, but an attempt to kidnap her throws Kallie into Sienna's arms and training as a submissive. Undisciplined, Kallie resists the discipline Sienna imposes on her. In spite of that, she finds herself irrevocably drawn into the sensual world of pain and pleasure. With each moment, Kallie falls deeper in love, and danger closes in on them with another strike. So, to protect her, Sienna goes hunting with a deadly vengeance determined to stop the merciless evil before it can make its last strike against Kallie.