According to the dust jacket on My Sister the Serial Killer, Korede's sister has "a very inconvenient habit of killing her boyfriends." The term "inconvenient" indicates that author Oyinkan Braithwaite will treat this grim situation with unexpected complexity.
Despite the fact that her sister, Ayoola, is also flighty, selfish, and manipulative, practical and dependable Korede comes to her aid whenever necessary. Short powerful chapters gradually and suspensefully reveal what is behind the sisters' unusual relationship. At times My Sister the Serial Killer is simultaneously humorous and chilling, especially at the moment the sisters' lives intersect at the hospital where Korede works.