S1, E4: When a serial killer goes on the rampage, Luther must put his personal life aside and delve inside the murderer's mind to discover what is driving him to kill so many girls, and why. Meanwhile, serial killer Henry Madsen, the man responsible for Luther's extended leave, has woken up from his coma. Because of Madsen, it's too dangerous for Luther to see Alice any more, but can she ever accept this?