DIANE D The Return Of The Other Personality! is the fourth book of the series DIANE D. It involves Diane D being locked away at an Upstate, New York mental institution for the horrible vicious slaughter one of her other personalities has committed a year prior. Family members of some of the other patients in the mental hospital want to know why do several of Diane D’s family members get to stay in the mental institution with her, while only one of them get to stay with their family member. The security guard tells them that they have to make sure a lot of Diane D’s family members are at the mental institution to keep Diane D’s other personality away, that they have to make sure her killer personality or killer entity do not take over Diane D’s physical body while she’s there.
Later on, Diane D is let out of the mental institution temporary on house arrest and is in her family’s custody for the time being and is back at the organization. It is causing fear around the organization making everyone feel very uncomfortable and very afraid knowing Diane D’s presence is there at the organization. Several children at the organization approach the staff members and claim to have seen Diane D sitting in a chair inside her grandmother Margarita’s office angrily looking out the doorway at them as they passed by Margarita’s office doorway. Staff members start to wonder could it be the evil, vicious, powerful, dangerous and murderous other personality of Diane D’s sitting there in the chair inside Margarita’s office angrily looking out into the hallway at the children. The children also claim to have seen something black strapped around both of Diane D’s ankles.
Diane D’s house arrest is over. She is locked back up in the mental institution. Her family is planning to do a Fundraiser for the victims’ families by putting on a concert. Diane D is planning to perform in the concert. She wants to know why the ticket sales for the concert are not being sold out so fast this time when they usually sell out real quick. She becomes suspicious. She thinks the ticket sales aren’t being sold fast enough is because people might still be afraid of her.
Diane D is let out of the mental institution temporary on house arrest again. Days later, a young white male named Kurt is very angry and very upset about the killing of his father who was one of the police officers or swat team members killed by one of Diane D’s other personalities. He secretly plots revenge against Diane D. When Kurt sneaks up the back stairwell of Diane D’s family’s organization with a loaded gun in his hands, he gets hurt in the process causing his mission to fail!
Diane D’s house arrest is over again. She is locked back up in the mental institution. Michael’s parents are in the lobby of the mental institution talking with him. They are scared for him. They fear for his safety and want him to leave Diane D. Diane D’s relatives and organization staff members visit her as she sits depressed and disappointed inside Margarita’s office inside the mental institution. They surround her trying to comfort her, but Diane D is so upset about the public not purchasing tickets for seats near the stage that she ignores everyone in the room.
Days later, Diane D and her family discover that even though the ticket sales for their family’s concert are practically sold out, still none of the rows of seats near the stage are being sold. Diane D is very upset about the rows of seats near the stage not being sold that she goes crazy and tries to escape right out of the mental institution right in front of her family! She tries to break out of her grandmother Margarita’s office by pulling and breaking away from her family! Her father, husband and brothers are forced to bend down and lift Diane D right off her feet and carry her as she remains out of control, until her grandma Margarita grabs a paddle that was beneath her desk, raises it high in the air and whacks Diane D right on the behind with it causing Diane D to scream and fall right out of her father’s, husband’s and brothers’ arms dropping to the floor! That still didn’t stop Diane D! She tried to make another escape attempt until Margarita swings the paddle and whacks her right on the behind several more times!
Diane D is let out of the mental institution temporary on house arrest again. She performs on stage at a theater with martial arts performers from Asia. At the end of the show, another young white male whose father was also killed by one of Diane D’s other personalities secretly aims a gun at her from the balcony after she and the other performers on stage take a bow.
An online commercial producer who is looking for a couple of female athletes hires Diane D and her cousin Dangerous Dana to do an online Sword Fighting commercial. When the Sword Fighting commercial is shown on the internet, Kurt and his family burst into the producer’s office and sabotage the idea saying that both Diane D and Dana don’t need to make money from the commercial due to them being criminals and that Diane D killed his father. The online commercial is later squashed and not shown any more preventing Diane D and Dana from making any more money from it. An owner of a wax museum is inspired by Diane D and Dana’s online Sword Fighting commercial and tells Diane D’s family that he wants to create Diane D and Dana’s online commercial in wax! He is turned down by Diane D’s family. Later on, the wax museum owner decides to secretly create wax figures of Diane D and Dana anyway behind Diane D’s, Dana’s and their family’s back hoping that Diane D’s family will all change their minds once he gives them a private viewing and they actually see the wax figures.
Kurt claims to see Diane D stalking him in a few different places on a few different occasions. He even claim to have seen Diane D stalking him right inside his own apartment building right on his floor! When a police officer confronts Diane D and her family about it at the family’s organization, Diane D denies ever stalking Kurt claiming that she does not know where he lives. Later on that night, Kurt has a nightmare. He finds himself inside a creepy forest or woods at night. He hears a deep mysterious voice way in the distance calling out for help! When he follows the sound of the voice, he is shocked to see that the mysterious voice came from Diane D! He sees Diane D five yards away from him down in the grass on her belly handcuffed, shackled and chained trapped in a contortionist position trying to break loose from the handcuffs, shackles and chains. When Diane D looks up and notices Kurt standing there, she asks him to help her. Kurt doesn’t feel that he should help or trust Diane D knowing that she’s been stalking him and knowing that she killed his father. He feels that Diane D somehow lured him there. He later gets chased by Diane D!
The following night, Kurt has another nightmare about Diane D right inside the same creepy forest or woods at night. This time, he gets stalked and attacked by Diane D and her look-alike demons! When Kurt wakes up, he tells his family and the police officer about his nightmare of Diane D and wants the police officer to arrest Diane D for the nightmares he’s having about her! The police officer tells Kurt that he cannot arrest Diane D over his nightmare. Kurt is afraid to go back to sleep fearing to have another nightmare about Diane D that he tries to force himself to stay awake, but he cannot stay awake! When Kurt falls only half asleep, he suddenly sees Diane D and her look-alike demons right inside his hospital room surrounding him!
The following night, Kurt has another nightmare about Diane D right inside the same creepy forest or woods at night! She is still in handcuffs, shackles and chains trapped in a contortionist position as she approaches Kurt! Kurt becomes frightened! He gets up off the grass then runs from Diane D through the dark forest or woods, but she winds up stalking him throughout the forest or woods! He cannot seem to get rid of her!