A certain Konstantin Rykov comes to the BEAGLE agency. He suspects that his wife Sonya is not faithful to him. In a conversation with Alina, Sonya admits that she really has a secret that she is afraid to share with her husband. It turns out that Sonya was raped by a serial maniac nicknamed “Elevator”, who is not the first time to attack women. To identify the criminal, Alina decides to take a risky step: she is ready to become “bait” for the maniac. With the help of Petrovich and Yoongi, she manages to catch the rapist. However, new details unexpectedly emerge: Alina suspects that Sonya is lying: “The Lifter” had nothing to do with her rape.
An attempt was made on businessman Marat Shaikenov. Shaikenov believes that this is the same sniper who has been keeping the entire city in fear for a month, committing more and more murders. Shaikenov turns to the Beagle detective agency with a request to find the sniper. Moreover, death now threatens not only him, but also his fiancée Ella. Investigating this complicated case, private detective Andrei Rostovtsev meets family psychologist Alina Belova, who, thanks to her professional experience, helps Rostovtsev identify the criminal. Rostovtsev invites Alina to become a member of his team.
Alina's fiancé, the famous journalist Dmitry Aristov, lost a flash drive with compromising information on Deputy Governor Stanislav Kravchenko, who, according to his wife Maryana, was involved in the murder of their housekeeper. The detectives, along with a new member of the team, 18-year-old Young, get down to business. One version replaces another, mysteries multiply. Thanks to Alina's professional instincts, she manages to figure out the true killer, whose name comes as a surprise to the whole team. After the successful completion of the case, Alina accepts Andrei Rostovtsev’s offer to become a full-time psychologist at the Beagle detective agency.