Kay Alisano, wolf shifter and daughter of the Shadow Pack's Alpha, is captured by the evil siren Verah as a captive blood donor for Gideon Marquet, imprisoned in Verah's basement. Kay is just another victim brought to Gideon, who is trapped by silver chains and bled by Verah, to sustain him until her death at his fangs. But Kay is different and Gideon realizes she isn't just another human. As a wolf shifter, every full moon she must give in to the call of the moon. Powerful in her own right, Kay must do what she can to free herself and Gideon from Verah's control. Gideon's love for Kay must stay strong to help this intriguing woman and himself.