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The Number 23
On Walter Sparrow's birthday (February 3), his wife Agatha gives him The Number 23, a book by Topsy Kretts, as a birthday present. Walter starts reading it and notices similarities between himself and the main character, the detective " Fingerling ". Fingerling is obsessed with the 23 enigma, the idea that all incidents and events are connected to the number 23. Walter too becomes obsessed with the number and attempts to uncover the mystery of the book's author, but he cannot find any information. Walter's son, Robin, is interested in the enigma too, but Agatha dismisses it as superstition.
In the book, Fingerling discovers that his lover, Fabrizia, is having an affair and stabs her to death. The police arrest her lover because he found her body and picked up the murder weapon, assuming it was a type of sexual roleplay. Fingerling then prepares to commit suicide by jumping from a hotel balcony, and the book ends abruptly. Walter later learns of Laura Tollins, a murder victim whose body was never found, and whose murder is similar to Fabrizia's death. Walter believes that the man who was sent to prison for Laura's murder, Kyle Flinch, wrote the book. In prison, Walter visits Flinch, who denies killing Laura or writing the book.
Robin discovers an address hidden in the book and they hope that it will lead them to the book's true author. When Walter confronts the man, Dr. Sirius Leary, he commits suicide by cutting his own throat. Before dying, Leary tells Agatha to go to a now-abandoned mental institution that he used to work at. At the institute, Agatha discovers a box with Walter's name on it. Walter discovers a code in the book that tells the reader the location of Laura's body. Walter and Robin find the skeleton, but when they return with the police, the skeleton is missing. After seeing Agatha washing mud off her hands, she admits that she moved the skeleton. Walter accuses her of being Topsy Kretts. However, Agatha says that Walter was really the one who wrote the book.
Agatha shows Walter the box from the institute that has his name on it. Inside, Walter sees the sources he used to write the book, and begins having flashes of repressed memories. In room 23 of the hotel in the book, Walter finds the missing final chapter of the book scribbled under the wallpaper. Walter used to be obsessed with the 23 enigma because it drove his father to suicide. He was also involved with Laura, who left him for Flinch, resulting in him killing her. After Flinch was sent to prison for the murder, Walter wrote the book in the room as an elaborate suicide note, changing the details of his confession into a deranged fantasy. Walter then jumped off the balcony, but survived. The resulting brain damage left him with amnesia, and he was sent to the institute to recover, and met Agatha after being released. Dr. Leary, one of Walter's doctors, read the book and became obsessed with the number, eventually publishing the book under the name Topsy Kretts.
Agatha arrives, and tells Walter that he has changed, which is why she hid the skeleton. Convinced that he will kill again, Walter attempts to commit suicide by running into the path of a bus. However, Walter does not go through with it, not wanting Robin to lose a father like he did, and exclaims that 23 is just a number. Walter turns himself in to the police for the murder of Laura. While he awaits sentencing, his lawyer says that the judge will go easy on him because he confessed. Walter declares that this is not the happiest ending, but it is the right one, and expresses hope that things will return to normal for his family once he is released from prison. Laura's body is laid to rest in the cemetery, and Flinch is present, having been released from prison and now at peace.
The credits begin with a Bible verse (Numbers 32:23), which reads: "Be sure that your sin will find you out."