The new Sherlock Holmes season 2 episode 1, the plot jumps so fast, who can tell me what the main line is?

The first episode of the second season continues the plot of the last episode of last season: just as moriarty and Shylock are fighting for their lives, moriarty's cell phone rings, and he receives a mysterious phone call and has to give up the game with Shylock. On the other end of the phone, a enchanting woman's hand appeared in the picture. She seems to have what moriarty really wants. Shylock returned to Baker Street and handled many cases with John. Because of John's blog, Shylock gradually became an "internet celebrity", and more and more people came to ask for help, but most of the time it was boring. One day, a man who fainted in Baker Street sent them a box of news of the death of a donkey friend. Shylock thought the situation was not serious and he couldn't go out, so John went to see the scene instead of him. Just as they were talking on video, an unexpected visitor came to Baker Street. They asked Shylock to put on a formal suit and go to a place. At the same time, a helicopter came from John to pick him up. It turned out that special agent McCullough took them to Buckingham Palace, where there was a very powerful client. An indecent photo of the powerful man fell into the hands of a woman named irene adler, and Mycroft asked Shylock to take it back. At the same time, Irene also received a photo of Shylock. Shylock pretended to be robbed, sneaked into Irene's house and saw Irene naked. Irene came straight to the point and told Shylock's identity and purpose. John triggered the fire alarm at the door. Irene looked at the mirror in the room in panic and let Shylock find the safe. Just as Shylock was trying to crack the code, several Americans with guns broke in and forced Shylock to open the safe. Shylock cooperates with Irene and John to subdue the enemy, and takes away the secret mobile phone stored in the safe in the chaos, but it is immediately discovered. Irene injected Shylock with an anesthetic and ran away. Although Shylock suffered a lot in this meeting, when they talked about the death of their donkey friend, they felt that "heroes cherish heroes" and had a good impression. When mycroft found out that American intelligence agencies were involved, he told Shylock to stay out of Irene's business. At Christmas, there is a party in Baker Street. Shylock received a gift from Irene. It was a mobile phone. In the morgue, Shylock found Irene's disfigured body and was very depressed. However, Irene suddenly appeared and took John away, telling him that she was not dead, hoping that John could get her mobile phone back from Shylock. Shylock followed John and found Irene alive. Shylock returned to Baker Street in a trance and found that American intelligence agents kidnapped Mrs Hudson, the landlord, and asked him to hand over his mobile phone. He thinks that the things in the mobile phone are not just pornographic photos. Shylock eliminated the gangsters and rescued Mrs Hudson, and Irene, who was in trouble, came to Baker Street. The password in her mobile phone is set to "I am locked by _ _ _" (I am locked by _ _ _), and the password needs to be filled in the middle. Shylock tried several times without success, so she had to give her her mobile phone. Irene has an email password from the National Security Bureau, and Shylock cracked it for her. The password is the flight number of the terrorist who wants to blow up the flight. Irene secretly sent the news to moriarty, and then moriarty sent a text message to Mycroft mocking the British intelligence service. Mycroft knew the plan was exposed, so he asked Shylock out. It turns out that both Britain and the United States have undercover at the top of the terrorists and leaked the bomb plan to the intelligence department. However, in order to protect the undercover's safety, they could not directly stop the terrorist attack, so they used corpses to disguise passengers to confuse terrorists. But the plan was cracked by Shylock and revealed by Irene to Moriarty, who was connected with terrorists, so the plan failed. Irene used the secret left in her mobile phone to coerce Mycroft into exchanging a lot of conditions and her own safety. She admitted that she was playing with Shylock. However, Shylock understood Irene's feelings for him through the reaction of Irene's rapid pulse and dilated pupils when she spoke, so she solved the password of "I am Shylock" (I am trapped by Shylock, and the combination of Shel and Locke is Shylock, which means I am in love with Shylock). Irene knew that if she didn't know the secret, her life would be in danger. She asked Shylock, but Shylock left without saying anything. A few months later, Mycroft found John and told him that Irene had been beheaded by terrorists. He hoped not to tell Shylock the truth, saying that Irene was in America and was protected as a witness. John told Shylock that Shylock asked to keep Irene's camera phone for him as a souvenir. There are many short messages from Eileen in the mobile phone, most of which are to let us have dinner together, and the last one is to say "goodbye, Mr. Homes" to him. The picture goes to the scene where Irene is beheaded. Irene sent the last message, saying goodbye to Shylock and quitting her eyes, but then she heard the special message tone she set for Shylock. She turned around, saw Shylock disguised as a terrorist, and said to her, "When I say run, you run." At last they managed to escape. Shylock regards Irene as a "woman"-the only woman who has overcome herself. This episode is adapted from a scandal in Bohemia. In this episode, Shylock shows more humanity. At Christmas, Shylock concluded that Molly had a beautiful gift for her sweetheart. When he picked up the gift box, he found his name written on it. Instead of being cold as usual, he apologized and kissed Molly on the cheek. In order to protect Mrs Hudson and avenge her injury, he threw the gangster out of the second floor window. He smoked cigarettes with his younger brother, talked about the past, and wished him a Merry Christmas for the first time. Because of John's existence, Shylock understands "love" and "care". Irene is Shylock's only female friend, and John is the most important person in Shylock's life.