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Who Is The Killer In 'One Of Us Is Back'?

Massive spoilers ahead—I need help putting the final twist together for the One of Us Is Back killer reveal. The Bayview books are my favorite mystery series.
2025-06-23 09:46:14
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11 Answers

Best Answer
Davie Basichis
Davie Basichis
This has been requested by another user and I believe they are confusing this with the third book by One of Us Is Lying author, ‘One of Us Is Back’ (check a fan wiki for confirmation, I do not want to give away any spoilers). Anyway, this has made me want to read more of a survival group situation and I recently read ‘All Of Us Are Dead’ by Joon-O. It is a zombie apocalypse novel set in a high school, so tension exists not only from the infected but from the other students trying to survive each other. The way the characters form alliances only to betray each other is ‘us vs. them’ at its best.
2026-07-21
Hazel
Hazel
The main character in ‘One of Us Is Back’ is actually the silent killer in the novel. Simon seems to be in the background of most of the story, but he is actually a genius killer. He has the ability to plant doubt into the minds of people long before he actually carries out the act. Throughout the novel the reader follows the ways in which past actions can have devastating effects. The calm character of Simon makes him a very unforgettable character. The final chapters of the book slowly reveal the layers of the broken man who was consumed by envy and seeks revenge in a very unbalanced way. His twist at the end of the book is surprising but also something that the reader could have come up with themselves due to the author’s great writing skills.
2025-06-25
Piper
Piper
In ‘One of Us Is Back’, the killer is revealed to be Simon Kalivoda. A deeply resentful man with a warped sense of justice, he pushed the group to their limits through a series of complex events and manipulation of their personal traumas. Running on a conviction of justice, which is revealed to be a mask for his deep-seated anger at being abandoned by others, it isn’t until the very end of the book that Simon is exposed in a dramatic and impactful reveal. His methods are calculated and can be described as neither anarchic nor random, and instead are harshly controlled. He even links back to previous events within the series bringing closure and satisfaction to all.

Simon’s ability to blend into the background until it’s too late to make any difference to save him makes him a particularly chilling character. The psychological manipulation he carries out, whilst the rest of the group are oblivious to his true intentions, is perhaps as disturbing as the physical acts he carries out later. The way the book explores the themes of revenge and redemption in an attempt to show how these two different paths can lead to similarly dark places and how they can have such negative consequences for all of those involved is also something that stands out, as well as the tragic and cathartic downfall of the main antagonist, Simon, in which all of his guilt is revealed in full.
2025-06-25
Benjamin
Benjamin
In the book ‘One of Us Is Back’ by Gareth Western the killer is Simon. He is a master at deception and is hiding in plain sight. Unlike most other villains, he doesn’t use physical force to kill but instead uses the characters’ worst fears against them. Simon has had a neglected childhood and so wants others to suffer as he has. He is a great character as he is the mirror opposite of the main characters and shows their worst characteristics. The final confrontation with Simon isn’t about fighting him physically but breaking his mind.
2025-06-25
Mia
Mia
There’s been a lot of chaos in the TV drama ‘One of Us Is Back’ and it’s all come from Simon. He isn’t just another psychopathic killer, his reasons for what he’s done are personal to him and to the group of friends. His games are psychological and terrifying as they make the friends doubt each other. But in the end it’s someone that they wouldn’t of thought of and the reason behind it is quite simple. It’s just another case of the villains of TV dramas are normally dark versions of the heroes and in this story Simon’s methods are intelligent and almost poetic as they represent the group’s own failures.
2025-06-28

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