My Sister, the Serial Killer Summary: A Dark Tale by Oyinkan Braithwaite
Introduction
In Lagos, a late-night phone call changes everything. Korede, a pragmatic and skilled nurse, hears three chilling words from her younger sister: “I killed him.”
This is the world Oyinkan Braithwaite creates in My Sister, the Serial Killer.
The novel is a darkly satirical story about family, obligation, and the lengths one woman will go to protect her sibling. It follows Korede as she cleans up yet another crime scene for her beautiful sister, Ayoola.
The narrative focuses on a suffocating bond and the secrets it creates.
Braithwaite is a Nigerian-British author.
This is her debut novel.
The book is best for readers who enjoy psychological tension, family drama, and dark humor.
It does not offer an escape, but a look into a twisted family dynamic.
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Book Snapshot
| Genre & Subgenre | Fiction / Satire, Thriller, Black Comedy, Family Drama |
| Core Narrative Tropes | Sibling Loyalty, Family Secrets, The Unsuspected Killer |
| Tone & Atmosphere | Satirical, cynical, practical, tense |
| Primary Conflict | Korede’s struggle between her love for Tade and her loyalty to her murderous sister. |
| Pacing Style | Fast-paced, episodic, and suspenseful. |
| ISBN | 978-0525564201 |
| Pages | 241 |
| Author | Oyinkan Braithwaite is a Nigerian-British author. She studied Creative Writing at Kingston University. Her debut novel, My Sister, the Serial Killer, won the LA Times Book Prize for Best Crime Novel. |
Read the Entire My Sister, the Serial Killer Book with a Detailed Chapter-by-Chapter Summary
TL;DR: A Snapshot of Loyalty and Blood
Korede is the responsible sister. Ayoola is the beautiful one.
Ayoola has a habit of killing her boyfriends, and Korede has a habit of cleaning up the mess.
The story is about Koredeās struggle as her sister sets her sights on a doctor Korede loves.
The tension builds as Korede must decide how far her loyalty goes. It is a fast-paced, darkly comedic thriller about a very messy family.
My Sister, the Serial Killer Summary: The Unfolding Crisis
Spoiler warning: this section details the entire plot.
The story begins at the apartment of Femi Durand. Ayoola has stabbed him on their one-month anniversary. Korede arrives to find a bloody mess.
She uses bleach to erase the evidence and wraps the body in bedsheets. The sisters drive to the Third Mainland Bridge and dump Femi into the lagoon. This is not the first time.
Ayoola has killed before, and Korede has always been the cleaner.
Korede is a meticulous head nurse at St. Peter’s Hospital. She is secretly in love with Dr. Tade Otumu, a kind and respected doctor. Her life is a controlled routine of work and covering for her sister.
Ayoola is the opposite. She is a social media-obsessed fashion designer. Her beauty captivates everyone, and she shows no remorse for her actions.
Korede’s anxiety grows. She begins confessing her secrets to a comatose patient, Muhtar Yautai, in Room 313. He is a silent repository for her guilt. At the same time, she tries to keep Ayoola away from Tade.
Her efforts fail. Ayoola visits the hospital and instantly enchants Tade. He asks for her phone number, and they begin a relationship.
Tade is oblivious to the danger he is in. He showers Ayoola with gifts, believing he has found a perfect partner. Korede watches in despair. Her jealousy and fear turn to rage.
She destroys the flowers he buys for Ayoola in a fit of silent fury. The pressure builds as Femi’s family starts a social media campaign to find him.
The police eventually come to question Ayoola. Korede coaches her on what to say. Their mother defends them, and the sisters present a united front.
While the police investigate, Ayoola leaves for a trip to Dubai with a wealthy businessman named Gboyega Tejudumi. He has been funding her fashion line.
In Dubai, Gboyega dies of a drug overdose.
Ayoola admits she watched him choke. He is her fourth victim. She returns to Lagos with expensive clothes and jewelry, then immediately reconnects with Tade. The cycle continues.
The stakes get higher. Muhtar wakes from his coma. He remembers Koredeās confessions. He tells her he will keep her secret, but he warns her to save Tade.
This warning comes too late. Tade reveals his plan to propose to Ayoola. Panicking, Korede breaks into Tade’s office.
She steals the diamond from his engagement ring and ransacks the room to make it look like a robbery. An innocent cleaner is fired for the crime.
The climax arrives with a frantic call from Ayoola. Korede finds her sister bleeding from a stab wound at Tade’s apartment. Ayoola claims Tade attacked her.
Tade claims Ayoola had a knife and he defended himself. Korede makes a choice. She helps her sister, threatening Tade and lying to the police. Ayoola’s beauty and their combined story are enough. Tade is arrested and loses his medical license. He tells Korede she is worse than her sister.
In the aftermath, Korede is ready to confess to Muhtar. But he has been discharged. He left his number, a symbol of her last chance at absolution. Korede burns the paper with his number.
She chooses her sister.
The book ends with Ayoola introducing Korede to a new man. He is holding roses. Korede smiles, already resigned to her role.
She is her sister’s keeper, no matter the cost.
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Characters In This Book
| Character | Role |
|---|---|
| Korede | The story’s narrator, a meticulous nurse who cleans up her sister’s murders. |
| Ayoola | Korede’s younger sister, a beautiful fashion designer who kills her boyfriends. |
| Dr. Tade Otumu | A kind doctor at St. Peter’s Hospital who falls in love with Ayoola. |
| Muhtar Yautai | A comatose patient who hears Korede’s confessions and later wakes up. |
| Femi Durand | Ayoola’s third victim, stabbed in his apartment. |
| Gboyega Tejudumi | Ayoola’s fourth victim, a wealthy businessman who dies in Dubai. |
| The Mother | The sisters’ passive mother who favors Ayoola and ignores their problems. |
| The Father | The sisters’ deceased father, a violent and abusive man from their past. |
The Novel’s Deeper Ideas
| Theme | How the book presents it |
|---|---|
| Sisterhood | Korede’s entire life is structured around protecting Ayoola, showing a bond built on trauma and obligation. |
| Generational Trauma | Flashbacks to the sisters’ violent father reveal the origins of their dysfunctional behavior and family silence. |
| Beauty as Power | Ayoola’s looks make people, especially men like Tade, ignore her flaws and believe her lies. |
| Guilt | Korede carries the moral weight of the crimes, seeking confession through a notebook and a comatose man. |
| Complicity | Korede actively destroys evidence and lies, making her a full participant in the violence, not just a witness. |
Who Is This Book For?
This book is for readers who like their stories with a sharp, dark edge.
Fans of psychological suspense will enjoy the tense cat-and-mouse game between the sisters and the police.
The story will also appeal to those interested in family dramas, specifically the complex and often destructive bonds between siblings. The setting in Lagos adds a layer of cultural richness.
The plot is driven by dark humor and a fast-paced narrative, not by deep character analysis. It is a good fit for someone wanting a quick, tense, and thought-provoking read.
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If You Liked This, Try These Books
- American Psycho by Bret Easton Ellis: Shares the themes of a meticulous killer and a satirical look at shallow societal values.
- Sharp Objects by Gillian Flynn: Features a disturbing family mystery with themes of sibling codependency and hidden trauma.
- Dial A for Aunties by Jesse Q. Sutanto: Another dark comedy about a close-knit family working together to hide an accidental murder.
- The Kind Worth Killing by Peter Swanson: A psychological thriller about sociopathic characters planning murders and making clever cover-ups.
Memorable Quotes from the Novel
“Ayoola summons me with these wordsāKorede, I killed him.”
“I bet you didnāt know that bleach masks the smell of blood.”
“Femi makes three, you know. Three, and they label you a serial killer.”
“He isnāt deep. All he wants is a pretty face. Thatās all they ever want.”
“Only the guilty go to jail.”
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