20. Dead Man's Switch

Complete story — includes the ending

Sherlock's first anniversary of being sober is approaching, but he does not want to celebrate the event. Meanwhile, a blackmailer targets the fathers of three rape victims and even the rapist - the blackmailer warns that a "fail-safe" accomplice will put the videos online in the event of his arrest or demise. Sherlock identifies a man named Milverton as the blackmailer. While breaking into the man's house, Sherlock witnesses Milverton being killed by a masked intruder, who then removes Milverton's body and laptop. Milverton has a blackmail ledger which lists payments to "Henry 8". Pistone, one of the blackmailed fathers, is arrested trying to dispose of Milverton's body. He confesses, but will likely receive a short sentence due to the circumstances. Sherlock finds "Henry 8", murdered nearly a week before. Pistone found Milverton, but the blackmailer offered him a share of the proceeds. Besides, Pistone did not get along with his stepdaughter, the victim. Milverton killed "Henry 8", not needing two accomplices. Pistone then killed Milverton and stole the laptop containing the blackmail material to take over the operation. Sherlock reveals that he is reluctant to celebrate his "sober-versary" because he does not want to be reminded of his last relapse.