When Dawn gets mad of her brothers reading her diary, she starts writing fake diary entries in order to mess with them. But things spiral out of control.
Dawn is tired of her brothers going into her bedroom and invading her privacy. She even has a door sign that says "NO BOYS ALLOWED" but the boys ignore it. Ricky even uses a marker pen to change the sign to other variations like "NO, BOYS ALLOWED" or "NOW BOYS ALLOWED." Dawn discovers that the boys have been reading her diary and gets mad at them. She hides the dairy even further to keep it away from the boys.
It gets worse when the boys sneak into Dawn's room when she's not around to look for her dairy. While looking for it, they find Dawn's sports bras and start arguing about what they are. Dawn enters the room and finds the boys messing with her bras. She tells them that they're her sports bra and they're disgusted. She throws them out and ties them out.
Dawn tells Mae that she's had enough and she needs to give the boys a taste of their own medicine. So, she starts writing fake diary entries to mess with the boys. In the first entry, she writes about how she has a very bad mouth fungus that causes hair to grow on the tongue. And the only thing that gives her peace is scratching her tongue with the tip of her diary pen (which Nicky has in his mouth). The boys get paranoid and start avoiding getting into contact with Dawn's saliva in anyway. To torture the boys, Dawn and Mae come back home with the best ice-cream that they know the boys would be craving to eat. Dawn offers them the remaining ice-cream. They all run away from it.
Next, Dawn ups her game. She writes another fake diary entry saying that she likes her brothers but she recently discovers that two of them are plotting against the other. They are planning to take the thing that he prices most. After reading this, the boys get paranoid. Nicky thinks that Ricky and Dicky are after him. And Ricky thinks Nicky and Dicky are after him. Dicky is concerned too but doesn't seem to care much. Each of the boys starts trying to bribe Dawn hoping that she would tell them what the other two brothers are planning. Ricky does Dawn's homework and offers to do more because Dawn is a nice sister and would tell him if anyone was going after what he prices most - like his perfect attendance record. Dawn plays along but refuses to tell Ricky anything. Nicky bakes Dawn's favorite muffins and hopes Dawn will tell him who is trying to go after his valued possession - his frying pan. Dawn and Mae enjoy the muffins but Dawn refuses to tell Nicky anything. Dicky makes a weak attempt by giving Dawn her own lamp as a present because she is his favorite sister. He's worried that Nicky and Ricky are planning to mess with his hair. Dawn takes the lamp and refuses to tell Dicky anything.
Dawn and Mae are laughing about how Dawn has been messing with her brothers so successfully. Mae wishes her little brother was hold enough to read her diary so she can mess up with him like that. When Dawn and Mae leave the room, it turns out the boys were hiding in Dawn's room. Each one of them had come to the room hoping to find more details about how the other two brothers were plotting against him. But now they know the truth: Dawn was just messing with them. They've got to get her back!
Later that night, Dicky knocks on Dawn's door while she's asleep and asks if he can come inside. He tells Dawn that he knows his brothers are up to get him and he will mess with them before they can get to him. Right after Dicky leaves, Dawn calls Mae to tell her how happy she is that it just got better after getting better! Early the following morning, Mae arrives at the Harpers' house before the boys wake up so that she can witness whatever Dicky did to Nicky and Ricky.
A few moments later Dicky comes screaming that his brothers are out for blood. Nicky and Ricky enter the room, with their heads shaved. Dawn is shocked. Dicky says he only shaved their heads because they were going to do something bad to him first. And how did he find that out? Dawn's diary? And why would Dawn write such a lie? Dawn feels compelled to tell the boys the truth about the fake diary entries and apologizes for messing with them. She tells them they should respect her privacy but they manage to make her feel guilty for causing more harm. The boys run into the kitchen and start laughing about how they fooled Dawn. They reveal that they were just wearing bald caps to fake having been shaved.
Dawn enters the kitchen a few minutes later with her head shaved too. She tells them that she felt bad for messing with them and so, she got her hair shaved too to show that she cared. Nicky and Ricky feel guilty and reveal that they were faking with bald caps. Dicky blames himself for causing the whole thing. So, he takes scissors, ready to cut his hair. Dawn tries to stop him but he makes a big cut anyway. Dawn then reveals that she was wearing a bald cap too. She and Mae had overheard the boys talking in the kitchen about how they messed up with her. The boys were talking loud with the kitchen window was open, while Dawn and Mae were literally sitting in the living room. They all acknowledge that they went too far but all is well, that ends well, right? Except Dicky is still shaved for real.
- Lizzy Greene as Dawn Harper
- Casey Simpson as Ricky Harper
- Mace Coronel as Dicky Harper
- Aiden Gallagher as Nicky Harper
- Allison Munn as Anne Harper
- Brian Stepanek as Tommy Harper
- This episode is a parody of the hit movie Diary of a Wimpy Kid
- The Title Also References The Movie's Title: Diary Of The Wimpy Kid.
- This is the third time we see Dawn's room, The other two were featured in Dawn Moves Out and Take the Money and Run.
- This is episode marks an absence of Squishy Paws
- This is the second episode that the boys mingle into Dawn's business
- It is revealed that Dawn's favorite muffin flavor are chocolate chip
- The "No Boys Allowed" sign may be a reference to the SpongeBob SquarePants episode, "The Slumber Party".
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