Left penniless and alone by the untimely death of her father, Sarah Lowell works as a day nurse at King’s College Hospital. Her daily walk to and from work crosses the Rookery of St. Giles, a dangerous place made all the more frightening by the fact that someone lurks in the shadows, watching Sarah, stalking her like a beast of prey. Enigmatic surgeon Killian Thayne offers Sarah his protection, but his sensual, commanding presence presents another kind of danger. Killian wears his professionalism like a mask, concealing the darkness buried in his soul. He is drawn to Sarah, lured by her intellect, her dry wit, and yes, her loneliness, for it calls to his own. Then a patient is found dead, drained of blood. Another soon follows, and another, and rumors paint Killian as the monster who killed them. As evidence mounts and the threatening presence that stalks her draws ever nearer, Sarah must decide if Killian is a man deserving of her love or a sinister creature determined to make her his next victim.