14. The Deductionist

Complete story — includes the ending

While getting prepped in a hospital for a kidney donation to his ill sister, serial murderer Howard Ennis escapes from custody and resumes killing. Sherlock is brought in to consult, but bristles after learning that he must work alongside Kathryn Drummond, an FBI profiler who wrote a book about Ennis. She and Sherlock have a past, but their association ended when she published an article profiling Sherlock (called "the deductionist" in the article to protect his identity) that predicted his forthcoming addiction. Meanwhile, Ennis is killing atypically. The experts are stumped until Sherlock realizes that Ennis is out to avenge himself on Drummond because the publicity from her false accusation that his father abused him devastated his family and led to the father's suicide. Ennis's sister is working with him. She stabs Drummond when the latter comes to apologize for her unsubstantiated claims; Drummond survives. Meanwhile, Joan faces eviction from her rent-controlled apartment when she learns that the man she sublet it to used the place to shoot pornographic films, but Watson's deductive skills make her realize that she has been set up by him.