Khaled convinces Hisham to read the novel "Investigation" and participate with him in implementing what happens in it. Khaled goes to meet Elwan but fails.
Hisham immerses himself in reading the novel "Investigation" and agrees with Khaled to uncover what is happening in it. He visits the characters in the novel, and discovers the suicide attempt of the character S.
As Hisham continues reading, every day something happens under a new title in the novel, while he seeks to win the final prize. In a flashback, his poor relationship with his parents and his leaving home come to light.
Hisham visits Mona and discovers new secrets about the novel. He meets the rest of the investigation team, and Khaled convinces them to have Hisham join them and divide the prize among them, but Jamila decides to challenge everyone and solve the mystery.
Hisham and his team seek to reach the author of the book, and he communicates with Imad, the owner of the publishing house, but to no avail. Heidi tries to confess her love to Khaled, but he pays no attention to her feelings.
Hisham reaches out to a psychiatrist under a pseudonym, who blames him for his sister Nadia's drowning. Hisham and Jamila communicate with his university teacher, Abu Al Futouh, to find out something about the book, and Hisham suspects that Imad is the author.
The group, accompanied by Hisham, tries to find out the author, and Hisham discovers that there is an intermediary between them and the author, and suspects that it is Jamila, but it turns out that Israa is behind informing Elwan's son of all their movements.
Elwan's son seeks to threaten Hisham and Jamila, and Israa unwittingly confesses to her relationship with Elwan's son. Hisham communicates with Elwan and tries to find out why his life story was mentioned in the book.
The team discovers that there is another book to decipher the "Investigation" novel, and they ask Khaled to read all the stories to solve the mystery.
On the last day of the novel, Hisham's team begins to tie all the threads together, and they discover Elwan's decision to get rid of all his money before his son seizes it.
Hisham investigates Mona's killing of her son, and Saber's killing of his wife and his throwing her out of the window of the house. Israa confesses that she is the spy who conveyed all the information to Elwan.
The group fails to stop the rest of the crimes found in the novel, and they refuse to receive the competition's money. Hisham is surprised to find that he is the first name in the sequel to the "Investigation" novel.