Holmes then refuses to help as he knows that Alfredo's brother is the reason for Alfredo's former drug use and life of crime. Meanwhile, Gregson discovers that Holmes has post-concussion syndrome and has Sherlock off duty until cleared by the doctor. Sherlock is unconvinced and refuses the case. After much detective grunt work Watson finds the apartment of the missing woman and realises that she has been kidnapped. Sherlock later identifies this man as one Guillaume de Soto, a high-ranking member of a French drug cartel and gang called Le Milieu.
Holmes then informs his father he will not help him kill Moriarty but has arranged a stalemate with her, as if she kills his father he will take over as the head of Moriarty's former criminal network, and in return Morland Holmes will not attempt to assassinate Moriarty, while he has assured Moriarty he suspects his father will die of old age in the near future. The first suspect is the person who called the number that triggered the bomb, but when he is quickly cleared the case turns more intriguing. They discover that the victim, a tissue donor, might have possibly been infected with something and murdered to cover it up. Mycroft, meanwhile, gives Yoder and the list to the dealers, but de Soto orders them killed. Tying the victims to their service in Afghanistan guarding an archaeological site, Sherlock questions an archaeologist and quickly deduces that she was stealing from her digs and is now killing her accomplices with the help of her ex-husband. An analysis of the hacked code leads to Pentillion, a company creating automated vehicles, who admit that they were hacked by a rival company with which Zolotov was conducting business.
During the case he runs into an old friend, Abigail Spencer, under the name Ann Barker. Bell is shot, protecting Holmes, by a man whom Holmes annoyed during an investigation. But when the murder is resolved fairly quickly, a larger and more sinister plot begins to reveal itself. Archived from on June 15, 2013. Joan tells Sherlock about Alfredo, so Sherlock pays him a visit and tells him that he needs new routines to keep up his sobriety. Also, as Sherlock stews over being beaten up by Shinwell, he decides to take out his aggression by dismantling the local organization of private investigators. One of Moriarty's agents discovers he is to be killed, but defeats his assassins and returns to kill Sherlock in defiance of Moriarty's orders.
Sherlock and Joan go to his house, but he dies in a car explosion. In the process of the investigation, Gregson must reveal that he and his wife have separated. Because he lied the immunity deal is gone but all of his testimony will be used against his gang. Also, Holmes finds himself the victim of identity theft after his medical records are stolen. Even though Sherlock and Drummond do not get along, they both have a similar idea of what Ennis is likely to do next.
Meanwhile, Joan is frustrated with Sherlock after he solves a case she was asked to consult on. Joan, meanwhile, is called to dinner by Sherlock's father, who Sherlock claims would never propose such a thing. Also, Sherlock's behavior becomes increasingly erratic when he secretly interacts with a mysterious woman. Once on prison Halcon can do whatever he wants. They find that Roy had a safety deposit box and they get a warrant to open it. The strange woman calls Sherlock to tell him goodbye. .
He looks into well-disguised murders and catches a serial killer named Daniel Gottlieb , who was hired by Moriarty's agents. Watson and her half sister, Lin, have conflicting reactions when their estranged biological father dies. During this time, Sherlock has been trying to treat Fiona as someone special, but his odd behavior only leads her to feel like she is a problem for him to solve. Formulating a plan to incriminate McCarthy-Strauss, Sherlock waits at a pier to meet with the business executive that Piller's report belongs to while Joan breaks into the executive's office and steals the report. Joan has a connection with the murders as she was a part of the operating team that she could have done to save him thinking that he was innocent.
Joan enlists a geologist to study the rock and they learn it houses a complete dinosaur fossil. She also gives him a flyer on soundproofing, which they are offering to pay for, as well as a jar of honey from Sherlock's honey bees. Eventually Holmes' meets Alfredo and tells him he has given Alfedo's brother the money he needs and told him what he thought of him and then forgiven him, and he has decided to get in contact with Mycroft. After a heated exchange at the beginning of the episode, Joan and Lin reconcile. Upon further discussions with Alfredo and Watson, both of them suggest that the reason Holmes won't help Alfredo is because of unresolved feelings towards his brother Mycroft Holmes. Meanwhile, Bell's crush on a colleague from work makes Sherlock realize that his relationship with Fiona is at an important crossroads. Abigail and Sherlock, at age 15, exchanged letters and from here is where Sherlock realized who he was.
After finding that the man was killed in a suspicious hit-and-run accident, Sherlock looks into the victim's conspiracy theories in order to see if he had hit on anything that might have made him a target. Mycroft uses a homemade bomb to destroy Sherlock's belongings and get his attention. Sherlock uncovers her plan to have the father of a woman she has kidnapped murder a man associated with the in order to make one billion dollars trading in currency. Morland, in an attempt to protect his son, then contacts Vikner, who thinks he is going to be able to kill off Morland. They eventually expose the curator of a natural history museum committed the murders to hide the proof of a scientific theory that would have cost him and his mentor their legacies.