Aria has served vampire lord Alexander as his thrall for three years. He forgets their blood oath renewal night for his new lover Carmilla, leaving Aria to a lethal curse. Aria turns to Prince Cassius, who saves her from drowning with a bonding kiss. Alexander, regretful, abducts her and forces a wedding. Imprisoned by his father, Cassius breaks free, objects at the altar, and defeats Alexander. Alexander gets 800 years in prison, Carmilla is banished, and Cassius reveals Aria was his mate long before their bond began.